Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd431a4913ec3058…

MALICIOUS

PDF

67.3 KB Created: 2021-02-26 01:15:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 64a613642152f6d1b9faf2611edee18b SHA-1: 399675c9f482acac9a08d97d54b29d88c79259eb SHA-256: fd431a4913ec30587bac34eaa156d95fe2a28450705c65e833ca8f95e97801fa
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://bologen.ru/strik?utm_term=big+green+egg+cover+large+nest PDF link annotation
    • https://cdn.sqhk.co/lewikokezina/Vhfgfgf/teppanyaki_menu_causeway_point.pdfIn PDF document text
    • https://kepijiloxa.weebly.com/uploads/1/3/4/1/134108658/ed2bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447487/normal_6037bdea8ae3a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420752/normal_5fdf20514981a.pdfIn PDF document text
    • http://shoes-storie.club/tigujeb1z1ar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416154/normal_5fe9b2c5c5554.pdfIn PDF document text
    • http://jobauthor.online/kifuwutopomanokidome6blfc.pdfIn PDF document text
    • https://tusatetop.weebly.com/uploads/1/3/1/4/131408029/7592a76aa6f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502336/normal_5ff01f295f305.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369323/normal_60192d1f95f70.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458125/normal_5fe05679a5dd9.pdfIn PDF document text
    • https://tusemebi.weebly.com/uploads/1/3/4/3/134316443/9483900.pdfIn PDF document text
    • http://wixiziz.iblogger.org/tenilanapogunoxepunofuj.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/cnhh8fC/51591460853.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409623/normal_602607680d882.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
    • 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_off0000bdca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDCA 4864 bytes
SHA-256: d3f71b12470ed84fef412be1ba150c6326052b44ebec7a54cb4fac7d71184ebb
font_01_sfnt_off0000ce56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE56 10444 bytes
SHA-256: b8adf41371744a4e9fee06c4b35136603416b0a718849f1b97d2df9521f5361b
font_02_sfnt_off0000f229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF229 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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