Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe6ac64d72f3c1da…

MALICIOUS

PDF

73.3 KB Created: 2020-12-29 21:29:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0f23c0d5f2bedfa9210a28ee737d4afc SHA-1: 52b7cdbc6c84520ec6bd2e4164c706d4c7001ab3 SHA-256: fe6ac64d72f3c1da94ab4d8c4e9f673b5f8803adada567f9cc2b9b13baa9d569
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/wb?keyword=best%20call%20blocker%20app%20android%202020 In PDF document text
    • https://bumobuzeki.weebly.com/uploads/1/3/4/4/134477779/1793882.pdfIn PDF document text
    • https://lekemevegov.weebly.com/uploads/1/3/1/4/131410090/xidizewonoxeza.pdfIn PDF document text
    • https://cdn.sqhk.co/lexuxeza/de1xzid/flower_garden_ideas_full_sun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/c4629806-f6a6-4e3d-bafa-f130af765c39/67459721900.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/6750712342.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/39125404087.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b402753-2290-400c-8a91-297591e6ceef/environment_and_planning_tactical_urbanism.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a4c78d6-3947-45ac-9bed-908cd4a03180/saniwixof.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/nijgadh_international_airport_eia_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40f91052-799f-43c7-abe9-b026f4dcf4cd/gigobutos.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/descargar_sony_vegas_pro_13_gratis_en_mega.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD255 5380 bytes
SHA-256: 835af1277b049f017f123ec2bd2805de35735f77a5b5357d3d416d8eb8ae9f66
font_01_sfnt_off0000e499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE499 11060 bytes
SHA-256: f1d020db58ce4c51c794dbf210babd717eed13716880a63c24ace8fa4b2a2ada
font_02_sfnt_off00010a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6E 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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