Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc8d9b3a55b02da…

MALICIOUS

PDF

86.0 KB Created: 2021-02-23 21:01:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0eb5dacdc4370c569c652894171b7981 SHA-1: 26d50854d1d17209b6b9aca59500d7dc12071e1b SHA-256: 5fc8d9b3a55b02da3b3be68051dd33e8f70b4e20fdf13aa46bfa38e078fdadf1
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://baarspo.ru/123?utm_term=history+of+philosophy+rap+genius PDF link annotation
    • http://artistichomesolutions.com/valaxorewalurugobefumeformqsd.pdfIn PDF document text
    • https://nogenovone.weebly.com/uploads/1/3/4/7/134745979/zaxogez-pavufinit-potelubulakarat-wedaw.pdfIn PDF document text
    • http://dkblogin-de.com/14825094951t3hbg.pdfIn PDF document text
    • http://stassikorskyi.com/rewonavewufovula7g1rb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415327/normal_600ce1e28ee47.pdfIn PDF document text
    • https://salewuso.weebly.com/uploads/1/3/1/3/131379029/3506875.pdfIn PDF document text
    • http://reestr.site/90805004730r7ohj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451221/normal_602e35ca8f330.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413975/normal_5fdf4c2e91eeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376858/normal_5fe97c8034b89.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488566/normal_5fc73674cecc8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459466/normal_6009c007830aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455890/normal_5fd0337ed31d6.pdfIn PDF document text
    • https://vejiledulibona.weebly.com/uploads/1/3/4/3/134318828/xonapufar-jumabenemete-womad-faxovisu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454821/normal_5fd9614869705.pdfIn PDF document text
    • http://znalomstvavip.site/lirefemiwujjl2y3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490974/normal_6008acd2482a8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000112cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CF 5224 bytes
SHA-256: 607c4626a5a6151fff28181cb998c974714d9745c81aecd2580b7e8000c67937
font_01_sfnt_off0001249e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249E 11388 bytes
SHA-256: 36bfb00b07cb84a6fed98432aadb9126b06095404af052f26eb12eab45a7c93d

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