Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7f5e66e443cf358…

MALICIOUS

PDF

79.3 KB Created: 2020-12-18 21:45:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 10cb1c9a58907c9dc16f3eec2b4caa33 SHA-1: 2ac4069ed70e75295d239109e06715cd185172c8 SHA-256: d7f5e66e443cf3583891e49f9bdd4d7775488a8c5b3d6afba3f8822a06a3300c
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the overall structure and link farm behavior point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafftec.ru/123?utm_term=general+lejeune%2527s+birthday+message PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410985/normal_5fd0b164331c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427785/normal_5fc058c3d89da.pdfIn PDF document text
    • https://dojudiwoju.weebly.com/uploads/1/3/1/4/131406456/163574.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371786/normal_5f89d0595ff52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366402/normal_5f99e9fbb9b37.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/384697.pdfIn PDF document text
    • https://kebekeloku.weebly.com/uploads/1/3/4/6/134639455/rerowirexepubaxeven.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401694/normal_5f956d03c0849.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451206/normal_5fa3bb754ffe4.pdfIn PDF document text
    • https://jutokikifugata.weebly.com/uploads/1/3/1/0/131070124/6760440.pdfIn PDF document text
    • https://puperoriwob.weebly.com/uploads/1/3/4/7/134715375/zuwumoxulu-tazexoreva-nenufafa-sefofamimu.pdfIn PDF document text
    • https://disadoxamegipu.weebly.com/uploads/1/3/4/5/134527150/zimafavex_zikazawapem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402944/normal_5fc75f4ce0e1f.pdfIn PDF document text
    • https://buveziketi.weebly.com/uploads/1/3/1/3/131398526/64162d6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc4c6e42e537a05ef21e5be/t/5fcfe7cd56ffb921e778eab4/1607460813325/skyblock_addons_mod_1._12._2.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc28db48787e87989768336/t/5fc6a24a9ee0f32b873de668/1606853194903/98190358218.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_off0000f66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66B 5624 bytes
SHA-256: c1f7a50966c8a5875048b340e31fbe7c441cb88c3cc6cd1c1df4ffdbe9727e1c
font_01_sfnt_off0001096c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096C 11424 bytes
SHA-256: ec902d705b1a0fbf87a33e9beb9ded26ca300311919142b038cc16df03c964d8

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