Malicious PDF — malware analysis report

Static analysis result for SHA-256 c669d16516543b9a…

MALICIOUS

PDF

69.7 KB Created: 2021-03-24 23:31:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8aece8939cb30ed49d7eb20a4375baed SHA-1: 4937e33c67e7f03333be3611341eec6abfe821c6 SHA-256: c669d16516543b9a9c46409de5f2ca551db703da64faeef2e66330fcc204b7cd
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically phishing. The embedded URL 'https://vilenefex.ru/strik?utm_term=hi-point+9mm+carbine+for+sale+canada' and the link farm URL 'http://docita.fun/499912157327cpxh.pdf' are the highest priority IOCs for potential redirection to malware or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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=hi-point+9mm+carbine+for+sale+canada
    • http://docita.fun/499912157327cpxh.pdf
    • https://cdn-cms.f-static.net/uploads/4460678/normal_6024becf12a06.pdf
    • https://cdn-cms.f-static.net/uploads/4366008/normal_603ad4e371669.pdf
    • https://cdn-cms.f-static.net/uploads/4474977/normal_60186084c1660.pdf
    • https://cdn-cms.f-static.net/uploads/4495390/normal_5fd6d164aadd2.pdf
    • http://luminar2-download.xyz/best_performing_mutual_funds_2020_usz1pjn.pdf
    • https://kedumapeba.weebly.com/uploads/1/3/4/5/134593926/9429eb220ebf11b.pdf
    • https://static.s123-cdn-static.com/uploads/4371023/normal_6006b231c5c6c.pdf
    • http://skidki-day.site/restatement_second_of_torts_section_402a9ymcb.pdf
    • https://bojibelatos.weebly.com/uploads/1/3/4/0/134040608/12cf004.pdf
    • http://hamsterbig.com/xulakexurawugidod9fuib.pdf
    • http://bigpleasure.ru/58742944702le16j.pdf
    • https://static.s123-cdn-static.com/uploads/4446016/normal_5ff27b2b33c8c.pdf
    • https://cdn-cms.f-static.net/uploads/4388827/normal_604ae42607627.pdf
    • https://cdn-cms.f-static.net/uploads/4419623/normal_602d9626e34a2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ea6c818a-0a14-4aba-bbd2-6e684a4cfb8d/duvamiluvodad.pdf
    • https://uploads.strikinglycdn.com/files/ede65650-87c7-41ce-b968-da4f3b79d578/betaxovi.pdf
    • https://uploads.strikinglycdn.com/files/5561b601-6936-4091-b94a-c83b3ad8a2a5/og_mandino_quotes_in_hindi.pdf
    • https://uploads.strikinglycdn.com/files/0147cb87-36e2-4147-a391-4ce35aff32fc/30595416388.pdf
    • https://uploads.strikinglycdn.com/files/51acd769-7b50-42b0-a658-b875109736d6/43886019219.pdf
    • https://uploads.strikinglycdn.com/files/d1089cee-e8bf-457d-8758-3ae4f421e6ee/somawunibomusi.pdf
    • https://uploads.strikinglycdn.com/files/dda6798f-3b29-4819-90e8-2ae209d5519a/taco_bell_shredded_chicken_quesarito_nutrition.pdf
    • https://uploads.strikinglycdn.com/files/d2703e6d-25a7-4d91-a9a7-a51b15192a89/mere_christianity_audiobook_free_download.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_off0000cfe5.bin
c02ede80777ec47a176057b9ea2c64dcceac16b9ca0cf08668e65a97c03d4668
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE5 5592 bytes
font_01_sfnt_off0000e2ca.bin
eae4662bf7b0053bbd8d5161c81195aac7fb445c05fdae292c5f12edb5abb670
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CA 11264 bytes