Malicious PDF — malware analysis report

Static analysis result for SHA-256 3768f161c3bbdf05…

MALICIOUS

PDF

70.0 KB Created: 2020-12-28 18:49:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 94efebd8c58185c899204c08ad2f3399 SHA-1: 91360c7d69beeaf771567f8fa1ba5dbf64119383 SHA-256: 3768f161c3bbdf05bbd4e9ce2ab33f3130e1cf9d3691ce8e35deb0a4fa7bf01a
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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.
  • 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://trafffi.ru/strik?utm_term=free+world+solitaire+card+games+online PDF link annotation
    • https://gilibowipasumew.weebly.com/uploads/1/3/4/5/134578686/japoripowigaluro.pdfIn PDF document text
    • https://cdn.sqhk.co/vivutazawi/Vs5EnGl/48818189689.pdfIn PDF document text
    • https://nenizuve.weebly.com/uploads/1/3/4/6/134615173/jigigig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vebisop/winscp_for_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/civ_6_beginner_guide_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76e299fb-fb0e-4db4-a191-0d619a481979/nursing_diagnosis_for_chf_and_copd.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/87773386142.pdfIn PDF document text
    • https://s3.amazonaws.com/runuzitexokol/tuzijopixunuwopaluduju.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/ardaas_karaan_full_punjabi_movie_hd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ee7bef3-cce6-4cb0-9feb-ca9c1c153e93/rukadokilubonetigewe.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/bulletproof_army_uniform.pdfIn 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_off0000d528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD528 5304 bytes
SHA-256: 0d88a94b783a4cd2898464904eb25147033513b6a5c0c61eb7d21afa9464a2d8
font_01_sfnt_off0000e72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72F 10720 bytes
SHA-256: 48fb4747ef55297edd16802cfaa816810bdfdf812b6cb9aee56716ea3a89bf1b