Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d3cdbd65b76e45c…

MALICIOUS

PDF

84.9 KB Created: 2021-06-06 02:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f505f986f5296746b3725e102db9b6fb SHA-1: afa350ee8039c5812f13420989cc2fc93ec9c9fb SHA-256: 3d3cdbd65b76e45cb1ea0b8229413c9e4ad05dd05c5352ab1e8470d3bf8e04a8
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. One prominent URL, 'https://synerhu.ru/pbw?utm_term=como+descargar+super+smash+bros+crusade+para+pc', is presented as a lure for downloading a game. While no scripts were explicitly extracted, the PDF structure and heuristic firings like 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://synerhu.ru/pbw?utm_term=como+descargar+super+smash+bros+crusade+para+pc PDF link annotation
    • https://tegimawemax.weebly.com/uploads/1/3/1/3/131383609/guruvixovo-gawiji.pdfIn PDF document text
    • https://zopopalolidipe.weebly.com/uploads/1/3/4/5/134500843/706644e.pdfIn PDF document text
    • https://kibinopojisetux.weebly.com/uploads/1/3/4/6/134662243/bfeba7c.pdfIn PDF document text
    • https://givurarole.weebly.com/uploads/1/3/4/5/134578012/sowabimuvedog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/37e80321-c8a1-49c8-ba6e-26ed53cfd190/what_is_static_and_dynamic_data_structure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b002dfd6-8f86-4185-98c1-0e5bd4dd40e7/how_to_connect_chromecast_to_iphone_4g.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ded3d9e6-b22c-449c-a805-a5d2b3c18c4e/kelegudusutepipemajadet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7fcb71d-ebb6-4458-8325-1b597a1bf259/losoluwifevozafu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/084481dd-b513-4a79-8873-7416888db6fb/respironics_evergo_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1643ebb7-0292-4d71-b4a4-cfdd92e1847f/iscsi_vs_scsi_performance_comparison.pdfIn PDF document text
    • http://wemilamozede.pbworks.com/f/how_to_get_hourglass_figure_with_exercise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3ccd155-a770-437b-bbcd-387aa4943bbc/how_often_to_do_running_records.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/920cc416-9dad-4994-b328-d0dadb2008da/jojiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e3f71c8-6aa1-436e-9443-3f1b9c9ad6d2/zifip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bfc9296-f84f-4b94-9e0a-84304673ef07/2008_jeep_wrangler_unlimited_x_soft_top.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb149dac-6f48-4c74-bbaa-161bb4123e7c/25897511490.pdfIn PDF document text
    • http://giwupiraride.pbworks.com/f/10902170871.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bfcd451-aa55-46c8-830d-1669481b5b5b/enfermedad_renal_cronica_codigo_cie_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5faf3062-fcab-4c94-ac34-b6dfdbe1fda6/how_to_forward_calls_avaya_2410.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8b5c722-859c-4161-8721-356e64a6a9aa/scary_stories_to_tell_in_the_dark_age_rating_aus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f7c667e-d623-436b-971d-00472372501d/50410053502.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca1399f3-1914-44ff-93fb-d8fadac0d4a4/17632036352.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14a94a92-234a-4609-9161-67760652b6e3/how_much_is_a_nikon_d40_worth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a526329b-1432-4b7e-b7e4-8658a22db0c7/kejibuzonew.pdfIn PDF document text
    • http://lururefisu.pbworks.com/f/pokemon_in_hindi_season_5_episode_18.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E3 5268 bytes
SHA-256: 2aaa131fc0f15f13bdda94054487ee326c18d5c5c00e5c4b74f647a5b13a5b7c
font_01_sfnt_off0000ebad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAD 6536 bytes
SHA-256: fb338f907cafd04cc02aab41c42c8d2647485f82d03ec8b92f258eb5ee058665
font_02_sfnt_off0000fb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB85 11144 bytes
SHA-256: 7843c083217d62a2f30210ca888f71ddee81905ef8a77ac101fb53405f8108ec
font_03_sfnt_off00012041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12041 16060 bytes
SHA-256: 313c3940a6f4aae92ceaa1b1a843de6e6f13411355a457aba6e018c383fce54c
font_04_sfnt_off000134d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D6 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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