Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a5f6c9689b06dab…

MALICIOUS

PDF

73.0 KB Created: 2020-12-25 00:56:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: fe87fa892d813e9b0d3c31698e19c346 SHA-1: 6d4f285d09336e7ac8c7dfa0fb9276ee50f3eddd SHA-256: 5a5f6c9689b06dabec0c87657a06cfd26a02bbd1da436a71261c2c7ebe32ea86
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 0.9997

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://trafffe.ru/strik?utm_term=black+panther+cast+death PDF link annotation
    • https://pivamaxisogen.weebly.com/uploads/1/3/4/4/134481881/pifezotawimazib-jidiwareso-tupotedaz.pdfIn PDF document text
    • https://cdn.sqhk.co/dabeluza/hiPjbhc/9850853469.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450890/normal_5fda62f86bb9e.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/belapigojat.pdfIn PDF document text
    • https://polabufasol.weebly.com/uploads/1/3/2/8/132814050/60fcd465bd6b6f3.pdfIn PDF document text
    • https://cdn.sqhk.co/lofopapenow/Vk7Aijd/gabukix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462678/normal_5fb4380063a67.pdfIn PDF document text
    • https://mutazodot.weebly.com/uploads/1/3/0/8/130874237/gepukaniteri-jisedome.pdfIn PDF document text
    • https://sadusobagobazep.weebly.com/uploads/1/3/0/7/130776682/7660568.pdfIn PDF document text
    • https://jedefefebakex.weebly.com/uploads/1/3/4/8/134870379/28e09a8cc9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/58591200259.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/xikaropolasixawolezixewe.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_off0000dfca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCA 5272 bytes
SHA-256: aa5cd3b857e3d7495d196c41cb210068e52af3a8230561b1fcc89d524d2ffd76
font_01_sfnt_off0000f1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B2 11080 bytes
SHA-256: 2193aa071f0059a4ba6f32ff1f4e5633a198816b7f66a7720c6d2fdc9a21d5c3

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