Malicious PDF — malware analysis report

Static analysis result for SHA-256 db53f6e64732f70a…

MALICIOUS

PDF

68.0 KB Created: 2020-11-18 06:28:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 6a40ecbd31d1bbc6e9b7937d7bc7730a SHA-1: d4de56de8cd01b8c81b1a31488efd80cd19d9f4c SHA-256: db53f6e64732f70a6feab8125541f1e23813d1d17bbf003201cfe64c46709f36
156 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 0.9997

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
  • 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://trafffe.ru/strik?utm_term=separate+peace+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379610/normal_5fa777d8dd28b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374002/normal_5f9bf1b5d28b6.pdfIn PDF document text
    • https://mabanopovofed.weebly.com/uploads/1/3/1/4/131453130/vobifaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421051/normal_5fa338ea20dc8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368982/normal_5f96c231b2298.pdfIn PDF document text
    • https://gukaguse.weebly.com/uploads/1/3/1/3/131398473/8871591.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379974/normal_5f909158365db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367920/normal_5f9e265e727b9.pdfIn PDF document text
    • https://vuxomikum.weebly.com/uploads/1/3/4/5/134587944/vafobalereveset.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ac8a6dc-a508-443e-8507-cf928c404817/262337461.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a6f7421-294c-4bec-a879-a4c0ced9fe25/13951397067.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_off0000cf27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF27 5044 bytes
SHA-256: 8a418225dfeda80096aab8327a9867f44319792333b88a06a13084304d0b6b12
font_01_sfnt_off0000e060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE060 10436 bytes
SHA-256: 82d2fa0007e2bbc863560ccb479f1fdbf531392b93e7ca541de98683d9aec56f

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