Malicious PDF — malware analysis report

Static analysis result for SHA-256 4184f0742a5f5a0e…

MALICIOUS

PDF

77.7 KB Created: 2021-03-18 08:48:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4fa099a4c471a7fd6901550d6e16fdd0 SHA-1: 516b3e99e60dabc24b75b1d869cb1f3dd564ecfc SHA-256: 4184f0742a5f5a0e974f2e6f4bc39bf5d7667d4411ab247932e665bbe441faa6
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external links, with 'dafemum.ru' and 'lnstagramservicecopyrights.com' being prominent examples. These links likely serve as a lure for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://dafemum.ru/123?utm_term=manual+allegro+5+espa%25C3%25B1ol
    • http://lnstagramservicecopyrights.com/zegepufoderenurufototopvx8le.pdf
    • https://xidaxawefitorat.weebly.com/uploads/1/3/5/9/135958331/2865618.pdf
    • https://ponopuxebi.weebly.com/uploads/1/3/4/3/134365602/dexikilomujov.pdf
    • https://jonomivebotuw.weebly.com/uploads/1/3/4/6/134683751/vokoditizona-juzuxelilo-sulubexunesarej.pdf
    • http://meetlait.pro/how_many_movies_in_the_maze_runner_seriesip665.pdf
    • https://notowupoguja.weebly.com/uploads/1/3/5/3/135316513/ed00bd848d7.pdf
    • http://sosyaltakipcipanelin.com/five_night_at_freddys_song_minecraftz6ez1.pdf
    • https://xamelanaf.weebly.com/uploads/1/3/5/3/135331914/18990.pdf
    • http://sexesex.site/blank_sheet_music_staff_paper1hyxp.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/db21f0aa-e745-4514-82d0-37f9c9e72412/which_dyson_hoover_is_best_for_pet_hair.pdf
    • https://6d428a25-da86-44fa-8f13-5b0f09742281.filesusr.com/ugd/3649d2_6ed378c083064e82b1f7d550ef5dda87.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6d565759-ea0c-4341-97e0-750d97bc3003/2014_toyota_camry_repair_manual.pdf
    • https://uploads.strikinglycdn.com/files/b82239ac-5db6-4268-9735-1f21fe29cea7/bunukeset.pdf
    • https://uploads.strikinglycdn.com/files/1850b569-0e31-4d72-adbe-b66fb8313e89/fire_and_ice_by_robert_frost_interpretation.pdf
    • https://4454cc88-256b-48ad-9013-c0414c72072d.filesusr.com/ugd/67e251_f6a8d403f01948f8837aa29cbeb73369.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c1bcfcfa-1a48-48af-a3c0-a74f3ededad8/spanish_verbs_for_dummies.pdf
    • https://uploads.strikinglycdn.com/files/be3cf578-b3db-46af-bcd2-cf1a3969dd84/rakitu.pdf
    • https://uploads.strikinglycdn.com/files/10a8564f-ea53-4ea7-ae50-210d8dc42246/rulonixesavaxixiwipi.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_off0000f02a.bin
e4ecc2e1553058fb9fd0ae77f9b3be8c3c725683e692aa7f4cf8f632b65183ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF02A 5328 bytes
font_01_sfnt_off00010225.bin
971305af953453ff119a5aec2b3d4b57dbcbd204c09e5862d08f95f0f618afd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10225 12324 bytes

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