Malicious PDF — malware analysis report

Static analysis result for SHA-256 72f4701a338c32f1…

MALICIOUS

PDF

85.1 KB Created: 2021-04-03 17:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b039d8f761438b037f4e6a5fe88e0835 SHA-1: 1129f9bebf6bb8203ffb06d6c2c481a0b4997455 SHA-256: 72f4701a338c32f187e9f9b4c91b441a5ff9e21a5aa2c28d1c9e306f31fe6748
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, with one pointing to a suspicious URL (vilenefex.ru) that is likely used for distributing malware or phishing. The heuristic 'PDF_SEO_LINK_FARM' suggests the document is designed to host numerous links, potentially to spread malicious content or engage in SEO abuse. No scripts were extracted, but the presence of external links and the overall structure point towards a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/strik?utm_term=is+mcat+prep+course+worth+it
    • https://junezemojevav.weebly.com/uploads/1/3/2/7/132740237/bb25a806.pdf
    • https://xivilikowigonun.weebly.com/uploads/1/3/0/8/130813923/4756279.pdf
    • https://nujobivodiji.weebly.com/uploads/1/3/4/7/134771327/2137a16f8f5e97b.pdf
    • http://a-trvl.ru/pegifevunam0q8s.pdf
    • http://ontrade.top/sell_warframe_account52phm.pdf
    • http://insurancecarusa.com/zaledaximaluradapelugaeo16.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/rimejiguvif/bevanizobefaso.pdf
    • https://uploads.strikinglycdn.com/files/5fd66595-ece8-43e1-82c6-fb639360cde7/how_often_to_change_power_steering_fluid.pdf
    • https://s3.amazonaws.com/lolaritemukole/news_reporters_doing_fortnite_dances_meme.pdf
    • https://uploads.strikinglycdn.com/files/e7ad7ac4-3a76-4cca-86e6-68c9eb226702/27199259882.pdf
    • https://uploads.strikinglycdn.com/files/24f873b2-18ea-45b9-a065-62cd808dd06f/how_much_does_it_cost_to_fix_a_dishwasher_uk.pdf
    • https://uploads.strikinglycdn.com/files/3f76c559-3ff7-4875-83b2-b3dd0ac5c946/what_is_a_good_score_in_sat_subject_tests.pdf
    • https://uploads.strikinglycdn.com/files/7bad929e-0b3d-4b62-bc75-498f0e8a001e/wubanejesag.pdf
    • https://s3.amazonaws.com/lorugipopuxe/poly_performance_10.pdf
    • https://uploads.strikinglycdn.com/files/a650f305-19d8-47d2-b268-f48c5866b333/installing_sunsetter_awnings.pdf
    • https://s3.amazonaws.com/jiwotarotavuz/haier_5000_btu_air_conditioner_walmart.pdf
    • https://uploads.strikinglycdn.com/files/76f56f26-5a70-4f2e-bbec-2ee534a40ce7/jixor.pdf
    • https://s3.amazonaws.com/fojaxexino/whose_reconstruction_plan_was_toughest_on_the_south.pdf
    • https://uploads.strikinglycdn.com/files/379bde5b-827a-492f-b1fa-df68a3ea731c/everything_will_be_good_meaning_in_tamil.pdf
    • https://uploads.strikinglycdn.com/files/c6bd694e-b105-4728-a4de-13e3e31a4c06/wozulivopezizemetewoxij.pdf
    • https://uploads.strikinglycdn.com/files/2dabb2ed-070a-45b5-a6fa-fbfeaa499aa7/8141431612.pdf
    • https://uploads.strikinglycdn.com/files/18ee3100-7355-4c03-b31e-a736860ccba8/sustainable_development_goals_list.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010054.bin
395f85d71906afb918849b88be49cac67a0af27b26c8922006a996a202085d80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10054 4948 bytes
font_01_sfnt_off0001112e.bin
d230658bc91eb63bd42a23ae12a27e745127973feff23d9c3b765a524fb04830		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1112E 11640 bytes
font_02_sfnt_off000138ba.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138BA 4324 bytes

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