Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f36004445a51d22…

MALICIOUS

PDF

76.1 KB Created: 2021-03-09 22:11:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2369245b7518980d5d986da747159a4a SHA-1: 5723d5cc39759bb63c53d2e22a5dc6255415e697 SHA-256: 5f36004445a51d22b561472de1115b4a6b638679e8f057255ede6dcaff871619
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful websites. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. The embedded URLs and the PDF structure point towards a phishing or SEO manipulation attack.

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-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://dafemum.ru/award?keyword=transfer+of+actionable+claim+pdf
    • http://winfreeiphone.xyz/how_to_use_my_power_cooker_plusga6pe.pdf
    • https://cdn.sqhk.co/wuluzajiroz/ggegc5z/wivaruneritalupepo.pdf
    • https://cdn.sqhk.co/nufesewepi/wigih52/lexenotexomovimuvex.pdf
    • https://cdn.sqhk.co/nanovinojon/didjfgg/98827883920.pdf
    • https://tejenopaje.weebly.com/uploads/1/3/1/1/131164027/xetuvibexem.pdf
    • https://pazijovipa.weebly.com/uploads/1/3/4/3/134327002/7608574.pdf
    • http://rufejupewanun.iblogger.org/how_many_questions_is_the_cpa_exam.pdf
    • https://cdn.sqhk.co/jotepomi/giNeifR/android_version_code_change.pdf
    • https://wawodupalise.weebly.com/uploads/1/3/4/6/134621762/9682471.pdf
    • https://mubasaji.weebly.com/uploads/1/3/4/8/134846322/585684.pdf
    • http://dorightunion.com/89815002824ufjzp.pdf
    • https://cdn.sqhk.co/bitowiso/gfK2hcl/wurutekudez.pdf
    • http://kigowamukidiba.iblogger.org/kebonizositaweweveze.pdf
    • http://imedo.ru/what_does_the_term_beautiful_disaster_meanee6t7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jatuxijor.epizy.com/29338497351.pdf
    • https://s3.amazonaws.com/kijelopazekune/duretepuxoroxoxesewevu.pdf
    • http://tamugaza.rf.gd/mobegemidavukuwe.pdf
    • http://rafodize.rf.gd/powerpoint_templates_medical_research.pdf
    • https://s3.amazonaws.com/vajefam/bharathi_kannamma_songs_starmusiq.pdf
    • https://s3.amazonaws.com/tajimipojimo/circular_saw_guide_for_cutting_4x4_posts.pdf
    • https://bit.ly/3d4w13k
    • 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_off0000ee3b.bin
52617c2db6f271f11c6dde409711d6965796f4328ea8101fb2c98e7e5ff82311
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3B 5392 bytes
font_01_sfnt_off0001006d.bin
7fd13ca45befccecbc02db4420d4ece239f2cbb9bda5f4107d4556323c225b0e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1006D 10132 bytes