Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc8de14256f5d854…

MALICIOUS

PDF

86.9 KB Created: 2020-11-10 23:48:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e66449bcb9ef44a09949e56c70d76b3d SHA-1: 2ac2465277a0c37b369f788f7ec77fdd08309c2f SHA-256: fc8de14256f5d8546624c2a88396e0a287c3ba661b65b5d03582bf7910326b22
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 0.9998

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://traffine.ru/strik?keyword=diego+rivera+wives PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367667/normal_5f87607c90b6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409257/normal_5f9e4d4574c2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405440/normal_5fa65ff1868c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368751/normal_5f8cbc6fa1cb7.pdfIn PDF document text
    • https://defugelunek.weebly.com/uploads/1/3/4/5/134524545/2136e05ba93ed56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369332/normal_5f8abc6272666.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445739/normal_5fa46fa0aef8e.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/cdf483bf-71e3-43b4-ac55-ee5af73c20a6/92642409530.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b27cb21-c108-4836-8381-3aaa2f012c82/35736513176.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27438d63-dffd-4908-b186-35d15f128177/a_practical_guide_to_usability_testing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c59b030e-8271-4f50-a387-96a3ab1f21cf/firebird_in_latin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85604674-036c-4bcc-b630-315a08234e31/13371210462.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9afae616-22ee-43e4-98bd-3d20ad9e579f/98207907505.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_off0001167c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167C 4972 bytes
SHA-256: 26c7b0df764bba43f3b4441feb442d12d6f4c15f0f70d1b26e89599805ebd0e6
font_01_sfnt_off00012795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12795 11924 bytes
SHA-256: cadbe4a527a421b1b7aeff882d5d8098d90c90654496fcd8c4c267aa6756ac2d

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