Malicious PDF — malware analysis report

Static analysis result for SHA-256 7df74d38090cd59a…

MALICIOUS

PDF

70.4 KB Created: 2020-11-22 14:40:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 059e529426e2a07d2e6a0839ad422e90 SHA-1: 91398428cfad5c1f79d25d368913051af63e1b14 SHA-256: 7df74d38090cd59ac51b4baa7841d572b7e9e2358178a4eaf4d76cbc44ca41d6
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, with the primary malicious URL being trafffe.ru. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to redirect users to malicious or spam content.

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://trafffe.ru/123?utm_term=dk+eyewitness+travel+guide+new+zealand PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446759/normal_5fa1273a042dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367646/normal_5f94a18693f00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382406/normal_5f9048b444cec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414498/normal_5f9fa9c0734d4.pdfIn PDF document text
    • https://lesofetu.weebly.com/uploads/1/3/1/3/131378838/ac80dde7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385412/normal_5f93a3eba2f4e.pdfIn PDF document text
    • https://minikugonon.weebly.com/uploads/1/3/4/5/134500064/wositoji.pdfIn PDF document text
    • https://wozuwonasanava.weebly.com/uploads/1/3/1/4/131483955/5167020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368732/normal_5fb2e0c8eab94.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/sugosubexez/hunter_college_msw_ranking.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/pilagu.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/35804787900.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/zaliwimidozudom.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_off0000d65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65B 5360 bytes
SHA-256: f92d8254945f4e090adc52472124be2d07c3ae6801a2e25b14f87a28e556cb9b
font_01_sfnt_off0000e8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D1 10640 bytes
SHA-256: 5ebd200661df19a468f2bf607eb2de32d866af97e1f7dcd1f8f4fb850b3fbc0f

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