Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffefe7309a175789…

MALICIOUS

PDF

66.7 KB Created: 2020-11-18 12:56:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: da2687d137637296174770ad9ed251f4 SHA-1: 717cda9a66e7929d62c3ecee7a05a0de81f28a56 SHA-256: ffefe7309a1757890485368f12db9bf17433977bc77635d82ace16f947c1d1cf
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation scheme. ClamAV and ML classifiers identified this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffset.ru/123?utm_term=remove+underline+from+link+html+css PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382773/normal_5fa448029dd83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419413/normal_5fb48df07bd30.pdfIn PDF document text
    • https://bajusumuke.weebly.com/uploads/1/3/2/7/132741128/8096751.pdfIn PDF document text
    • https://xamudoniganotew.weebly.com/uploads/1/3/4/5/134509964/11d35.pdfIn PDF document text
    • https://pinukozemaf.weebly.com/uploads/1/3/4/7/134713375/zitaxarabe.pdfIn PDF document text
    • https://namoxatiki.weebly.com/uploads/1/3/4/4/134477177/6486339.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390641/normal_5fad9dc3d20d4.pdfIn PDF document text
    • https://nirorozarijax.weebly.com/uploads/1/3/4/3/134342495/zemor.pdfIn PDF document text
    • https://tenabawik.weebly.com/uploads/1/3/2/7/132710661/pubedunimifewuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422168/normal_5f9f08b8931c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485448/normal_5fb48ccd74f0b.pdfIn PDF document text
    • https://vefozifus.weebly.com/uploads/1/3/4/3/134382693/rilerovubidip_xosivenopu.pdfIn PDF document text
    • https://runebipunozup.weebly.com/uploads/1/3/1/4/131406604/faruf_sekabebuw_xezatupa_zoxuped.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502563/normal_5fb2c27f4bdc5.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/db23c40f-b02f-4013-9872-1477689ae87e/bilawujajijuvug.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_off0000c431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC431 5184 bytes
SHA-256: f6f72bf4bab2002955fab503a2508cb284e814788f3f0ad69895782633b35d37
font_01_sfnt_off0000d5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BA 11720 bytes
SHA-256: 78e3c3a8ac68345eec235fd957392f5ac6761603711e1e5e63a33e13e019b4d1

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