Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c704f9a2e7b0ebd…

MALICIOUS

PDF

74.6 KB Created: 2021-03-15 11:50:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4caa316e3eeaa705c4cd41521f778df6 SHA-1: 2665188635c21fc277038bf433ee16e9356d5f7e SHA-256: 7c704f9a2e7b0ebd0da89dd59ca01ebcd0354b2779007c3e0d32fc68a1fc2472
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, including one pointing to 'vilenefex.ru', suggesting it is used for phishing or to host malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a pattern of using disposable hosting for link farms, reinforcing the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://vilenefex.ru/wix?keyword=anthony+oneal+graduate+survival+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4453914/normal_5fffd3e9bcc3c.pdfIn PDF document text
    • https://cdn.sqhk.co/jitegoji/jejhrE6/35677589337.pdfIn PDF document text
    • https://cdn.sqhk.co/teposodigar/0SigZCK/55245271575.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490273/normal_5fecf215bf371.pdfIn PDF document text
    • https://cdn.sqhk.co/pesofesidoke/9YIhfkP/fbar_report_highest_balance.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450151/normal_603d74fe1ae59.pdfIn PDF document text
    • http://rubewox.sportsontheweb.net/4852152578.pdfIn PDF document text
    • http://nexipufogavajid.getenjoyment.net/fejejimunukokopavijut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405409/normal_5fd86deecb6f2.pdfIn PDF document text
    • https://cdn.sqhk.co/bulelovuroga/djejfih/spelling_and_grammar_check_free.pdfIn PDF document text
    • http://lemakomude.sportsontheweb.net/rinofeviroromarororitatif.pdfIn PDF document text
    • http://fibiver.mygamesonline.org/bixenu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6cf80756-66c2-4d2e-b15d-ff1677cb7115.filesusr.com/ugd/2257e8_c0a23d21c5664badb40b63930101e244.pdf?index=trueIn PDF document text
    • http://wotidupodugi.myartsonline.com/university_games_brown_bear-panda_bear_what_do_you_see_game.pdfIn PDF document text
    • http://bexovivuvere.myartsonline.com/in_praise_of_shadows_summary.pdfIn PDF document text
    • http://mixezized.myartsonline.com/exercices_cercle_trigonomtrique.pdfIn PDF document text
    • https://033a7475-7ccb-45c1-8f1e-38fd320d48d0.filesusr.com/ugd/03a576_55addf4f76404ce2b5a42a3fa2754cab.pdf?index=trueIn PDF document text
    • https://69df74eb-9f83-488d-97bb-abb55063df61.filesusr.com/ugd/f34323_67135db63c9845b9b29759ed42451ced.pdf?index=trueIn PDF document text
    • https://44f39d5c-a655-4437-91b6-62b11e148e71.filesusr.com/ugd/eb4c03_84476374b44a4f6fa6149601544282ee.pdf?index=trueIn PDF document text
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_aab2f2dc281f4a07a433df394d96b61f.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C9 5236 bytes
SHA-256: e753ec555674ffddf781387334270c4f1544ea48cb83069de070763648442ff7
font_01_sfnt_off0000f8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A4 10704 bytes
SHA-256: dc77206b69dd581aceeb7326a1364ec756cac52b3e05b4072214c1f938ecd9b1

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