Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f090ca5b2ac77da…

MALICIOUS

PDF

75.0 KB Created: 2021-04-20 08:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 784149233350d9948500da28249caf19 SHA-1: ba4590681d1c9db338b103624a6d877e507fa80d SHA-256: 7f090ca5b2ac77da5899009344eb9554f1ab270014a2857214e6c2d3c22b2371
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a phishing or SEO manipulation tactic. ClamAV detection and ML classification strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

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://druttle.ru/strik?utm_term=how+to+tell+if+your+cats+old
    • https://cdn.sqhk.co/vegedusovo/ij9ggRB/kleptocats_2_kitchen_purple_ribbon.pdf
    • https://static.s123-cdn-static.com/uploads/4457620/normal_5ff23bae93235.pdf
    • https://cdn.sqhk.co/wuluzajiroz/zifhjhc/gdpr_legitimate_interest_assessment_template.pdf
    • https://cdn.sqhk.co/kasesiseb/dglWtjh/titozawefapu.pdf
    • https://cdn-cms.f-static.net/uploads/4480758/normal_605a466a4ca05.pdf
    • https://cdn-cms.f-static.net/uploads/4381291/normal_6019a9033179b.pdf
    • https://pudisemibupar.weebly.com/uploads/1/3/4/0/134096773/6ff94464191a3.pdf
    • https://cdn.sqhk.co/tipefimex/U62Ju6y/85213849895.pdf
    • https://fefojaza.weebly.com/uploads/1/3/4/4/134480993/bopunagasofi_nowobobevulomij_larexoduda_nuberumim.pdf
    • http://kifenefazujiz.iblogger.org/complete_pet_cambridge_free.pdf
    • https://devigejijakefu.weebly.com/uploads/1/3/2/7/132740662/8a76b3b.pdf
    • https://cdn.sqhk.co/suwixowefa/ichvgjQ/boosted_rev_owners_manual.pdf
    • https://cdn.sqhk.co/bigulikexupa/bhjhfib/zombie_shooter_3d_uptodown.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nosepevozux/93722211657.pdf
    • https://s3.amazonaws.com/vezumobigodub/febojalajesukonu.pdf
    • http://vabibago.rf.gd/carnatic_music_notation_book.pdf
    • https://s3.amazonaws.com/retobifulipo/spring_boot_interview_questions_and_answers_javatpoint.pdf
    • https://s3.amazonaws.com/xapidajovaji/coolie_no_1_movie_480p.pdf
    • http://tuxizowivu.rf.gd/google_chrome_android_address_bar_on_bottom.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_off0000e6ec.bin
358f584b6c5a169deb8198ec211d3de62b7cd9a50455d954873e521c9b6f7d14		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EC 5168 bytes
font_01_sfnt_off0000f8a6.bin
dd2a2547903331768a4d4400a416cc9f7e072d826d611f5a4542fefce0f859e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A6 10848 bytes

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