Malicious PDF — malware analysis report

Static analysis result for SHA-256 c236efbce127ebe0…

MALICIOUS

PDF

100.1 KB Created: 2020-12-23 02:10:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 9ddd760ce2d696b6819fbedbf766a691 SHA-1: c36f17d5f2525389638bccf61fb56108877a7c62 SHA-256: c236efbce127ebe01f898f18f73fe746723cd1531487a1ac7bd595ee166f184f
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. This suggests the document is part of a link farm or phishing campaign designed to direct users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/strik?utm_term=sling+bags+for+men In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366360/normal_5f871357b9c0f.pdfIn PDF document text
    • https://sakafafemowuva.weebly.com/uploads/1/3/4/6/134694971/kesakupikuwewo_dokemugizawukes_fejiga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426277/normal_5f9cc3bb6b6a5.pdfIn PDF document text
    • https://tivagojeno.weebly.com/uploads/1/3/4/7/134714391/piwudazujubu.pdfIn PDF document text
    • https://womazineput.weebly.com/uploads/1/3/4/8/134895737/236a72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369629/normal_5f8ab32d766f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385230/normal_5f9111d87c6a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379498/normal_5f8d12e229de2.pdfIn PDF document text
    • https://fomunova.weebly.com/uploads/1/3/4/6/134684458/8997279.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426695/normal_5fa0fc6703c11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417535/normal_5fb7968794c6d.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/5fc793808c9e503d27aa85e4/t/5fd6b5ec267c8d0ace53f50e/1607906797144/word_problems_involving_factoring_with_answers.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdd28e788390d34f381f39e/t/5fde61885809ae3434f9ea1a/1608409482197/zuxojenedepopufunenis.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe1dbe9d79364840572bc6/1606294974946/infinitely_many_solutions_sign.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3817916f6d44b07cf1e26/t/5fcb73ad6e74d26c6fff2f18/1607168941892/10602288101.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_off00014a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A27 5332 bytes
SHA-256: de037e5ecdb8be0b5ebfaab1f265692eb43eb47c126b1dcb05b17eac5b37003d
font_01_sfnt_off00015c30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C30 11484 bytes
SHA-256: 3d8fb542b7c25e2d52a3965b9cf4c6d37173adde07dbb313d3a6ff33ccf15995

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