Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d470c1282aa872f…

MALICIOUS

PDF

86.0 KB Created: 2021-04-05 22:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0e8de19b0c1b24b859fd63aa2c73094 SHA-1: 54d018b5041da97b5f380d4d19bf41e06d0051e2 SHA-256: 6d470c1282aa872fef2ce87f3603742e13007c3a539ba9d8f0e729b6af001c54
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a "PDF_SEO_LINK_FARM" heuristic, directing users to various websites. One prominent URL, "https://vilenefex.ru/award?keyword=basic+chemistry+interview+questions+and+answers+pdf", suggests a lure to disguise the malicious intent. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/award?keyword=basic+chemistry+interview+questions+and+answers+pdf
    • https://cdn-cms.f-static.net/uploads/4465705/normal_602466fe1479c.pdf
    • http://fesufobototezer.mywebcommunity.org/action_research_steps.pdf
    • https://static.s123-cdn-static.com/uploads/4479451/normal_5fffa2da3c8c7.pdf
    • https://cdn.sqhk.co/jalinutaxos/hghbRhb/real_boxing_fighting_game_unlimited_money.pdf
    • https://cdn.sqhk.co/porodiwaten/JnPaXgd/vatalakado.pdf
    • https://cdn.sqhk.co/wuvinudubuno/fgdKuHt/52263328322.pdf
    • http://xajavawinereko.mywebcommunity.org/eclipse_4_rcp.pdf
    • https://jisasulozif.weebly.com/uploads/1/3/4/3/134371627/538029.pdf
    • https://static.s123-cdn-static.com/uploads/4387567/normal_5ffce090eba4c.pdf
    • https://wajigigo.weebly.com/uploads/1/3/4/5/134588105/xirori-redulil-zerakubebopike.pdf
    • https://fuzifilagowiw.weebly.com/uploads/1/3/4/6/134698760/5979043.pdf
    • https://xanuzejo.weebly.com/uploads/1/3/1/6/131637194/2a2bca8f5521d2.pdf
    • https://cdn-cms.f-static.net/uploads/4367923/normal_6069c43f96a65.pdf
    • https://cdn.sqhk.co/lasumalena/jiha9ge/frosty_the_snowman_piano_sheet.pdf
    • https://cdn.sqhk.co/xogovofofi/sahjgen/wheel_of_fortune_free_play_rules.pdf
    • https://cdn.sqhk.co/kavejufa/jiW4IAq/angry_birds_2_movie_songs_download.pdf
    • https://cdn-cms.f-static.net/uploads/4408987/normal_604f9ce651bd7.pdf
    • https://cdn.sqhk.co/lekuruzomef/hdjiihs/stick_dragon_playground_human_zero.pdf
    • https://cdn.sqhk.co/nizekidido/ligjgu8/amgen_growth_strategy.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/dbd9bb17-1dac-4464-93c3-fe0d59252f14/rekebefumaxonogawo.pdf
    • https://uploads.strikinglycdn.com/files/91ec2a90-fc9f-4876-b95e-0f72c68e16f7/how_to_put_ge_oven_door_back_together.pdf
    • https://uploads.strikinglycdn.com/files/507ed871-f7e1-47ae-8d65-9f7c4e012406/what_are_the_different_types_of_informational_text_structures.pdf
    • https://uploads.strikinglycdn.com/files/040a50c5-db06-4a5e-93f9-48810adc5ce1/wamaredidujar.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_off00011346.bin
4c758a04e2823e1eb437c996af131ab471bd4929763566f9680dcbe4ff732ea6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11346 5792 bytes
font_01_sfnt_off000126e9.bin
c145b70deb715dad6b5699ef08b170a8b2cde984debba8eb6d810f7a395a6128
pdf-font-stream PDF embedded font (sfnt) at offset 0x126E9 10780 bytes