Malicious PDF — malware analysis report

Static analysis result for SHA-256 1172f2220665fa73…

MALICIOUS

PDF

76.7 KB Created: 2021-06-01 08:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11fdd6414b7f6cfe25b999e91cae5e45 SHA-1: 3476ebf58b8570a9cda396af870d56530a98040d SHA-256: 1172f2220665fa73903d877216744c29c04184c6d7128e9610d0b13306c89fb7
196 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model assigned a high probability of maliciousness. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://queure.ru/pbw?utm_term=do+you+have+to+report+car+accident+to+police', is suspicious and likely part of the malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://queure.ru/pbw?utm_term=do+you+have+to+report+car+accident+to+police
    • https://tilijaxak.weebly.com/uploads/1/3/1/3/131381787/1ca727e85a.pdf
    • https://vunubudewodazuz.weebly.com/uploads/1/3/4/3/134340329/3061794.pdf
    • https://uploads.strikinglycdn.c
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/998c067d-50fc-4f73-86ac-71c1bb60d7a7/roland_micro_cube_rx_bass_amp_review.pdf
    • https://uploads.strikinglycdn.com/files/f18b6d80-0e04-4513-9d47-7a9f7497b089/sketchup_pro_license_free.pdf
    • https://uploads.strikinglycdn.com/files/61352cce-6394-4091-b485-bf3b42cd1acb/lunoxuzedizonugoponukes.pdf
    • https://uploads.strikinglycdn.com/files/67df683a-1ddf-4ff3-9843-5f48f400e800/gobelivuxidulixeribemur.pdf
    • https://uploads.strikinglycdn.com/files/f4ecb694-48df-46ba-add3-22dc50f8dbe1/11108919005.pdf
    • http://lijegazoz.pbworks.com/f/how_to_make_deep_house_beats_on_fl_studio_12.pdf
    • https://uploads.strikinglycdn.com/files/cb5daaec-9ffc-498c-927d-53fb9193c730/62379197980.pdf
    • https://uploads.strikinglycdn.com/files/30c13ae7-86db-42c5-8011-78d44ec89091/how_to_do_leg_curl_on_bowflex_xtreme_2.pdf
    • https://uploads.strikinglycdn.com/files/4f95e1af-37c6-43a7-ac7f-9bcde157df0d/45790098400.pdf
    • https://uploads.strikinglycdn.com/files/017b34be-204f-4bfe-9dcd-a57f2c68971f/96063586814.pdf
    • https://uploads.strikinglycdn.com/files/36ad7901-72a1-4af8-8d21-702ed8d85e28/monkey_king_the_lost_empire_2001_espaol.pdf
    • http://midevodimu.pbworks.com/w/file/fetch/144433974/adobe_photoshop_cs3_crack_file_free_download.pdf
    • http://wojipag.pbworks.com/f/how_much_does_carvel_ice_cream_cake_cost.pdf
    • https://uploads.strikinglycdn.com/files/1833ee80-b4e9-4cb0-b628-d2797ad71a5f/2825248264.pdf
    • https://uploads.strikinglycdn.com/files/5f182933-65dc-4897-a966-c35a10e817b9/minitovudasawofisir.pdf
    • https://uploads.strikinglycdn.com/files/536f9dc1-dd5f-4366-a3a7-dbc793067904/how_to_start_a_community_action_group.pdf
    • http://lakebimutep.pbworks.com/w/file/fetch/144421257/om_shanti_oshana_movie_watch_online_with_english_subtitles.pdf
    • https://uploads.strikinglycdn.com/files/cb7740ea-24f8-4e52-8980-6d4cbbd5ff1d/how_to_toilet_train_in_3_days.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f071.bin
44d21633e35869d179437d676303a6b53a3011f0178d32926e578b6e6228a267		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF071 5144 bytes
font_01_sfnt_off00010202.bin
b34a4674de48ff46ba6c171a0981e60772b7d745fa029867605162f6bd1e3965		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10202 10324 bytes

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