Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb29cfb860f9576e…

MALICIOUS

PDF

79.8 KB Created: 2021-04-30 19:41:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba1f7e8119b1c0edf3fe57851497174c SHA-1: 1ad6eaa7298ee24ca249032dbadf727f1ed53bf4 SHA-256: eb29cfb860f9576e0190f8890838b7e3db1bdef043065fc01dc92af7bd1915ca
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The PDF contains a large number of external links, suggesting it functions as a link farm or phishing lure. The primary malicious URL identified is https://dafemum.ru/strik. No scripts were extracted, but the PDF structure and link farm heuristic indicate a likely attempt to redirect users to malicious 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-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/strik?utm_term=schumacher+xc103w+battery+charger
    • https://cdn-cms.f-static.net/uploads/4489977/normal_5fdc3579efb48.pdf
    • https://gubuwogufulero.weebly.com/uploads/1/3/4/6/134608521/8714840.pdf
    • https://vewominejijisos.weebly.com/uploads/1/3/6/0/136053907/topufevemuniv.pdf
    • http://sowivonowiso.iblogger.org/71770632600.pdf
    • https://dibodowe.weebly.com/uploads/1/3/4/6/134686502/viziwibar.pdf
    • https://karaxofuko.weebly.com/uploads/1/3/5/3/135344752/52bc3a.pdf
    • https://biwezufum.weebly.com/uploads/1/3/4/8/134872286/jegubozifosoni.pdf
    • https://cdn-cms.f-static.net/uploads/4457847/normal_601af46fc20ae.pdf
    • https://ziduxaxeg.weebly.com/uploads/1/3/1/3/131380546/6509990.pdf
    • https://wixepivod.weebly.com/uploads/1/3/0/7/130775856/9332706.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5fd33b24-cde6-4519-aff1-5b0201c2a49e/84906562651.pdf
    • http://turekepopede.rf.gd/warunenubolalixi.pdf
    • http://mogopubu.epizy.com/weber_grills_charcoal_small.pdf
    • https://uploads.strikinglycdn.com/files/e29e3ab5-e76c-4e2a-84f2-ee665cdf034b/letra_y_acordes_libre_el_espiritu_de_dios.pdf
    • https://s3.amazonaws.com/tikoweravisixu/xakaxisopuvodikonumu.pdf
    • https://s3.amazonaws.com/gasodamuza/46177027327.pdf
    • https://uploads.strikinglycdn.com/files/5582425a-c762-4bb4-87cd-3e7fd933b14e/titevaxonapogebozur.pdf
    • https://s3.amazonaws.com/jeworurowam/amiina_al_mufti_free.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_off0000f835.bin
ebc130fbfb6b2f9f0ae877b826c864f4395d25707480cf0f0da8784f2ea133fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF835 5864 bytes
font_01_sfnt_off00010c29.bin
9256cb8dee7a63d87cbf1f60959b1bbe6fde36450df0202b44605a0aa6081d0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C29 10972 bytes

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