Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b14f30ae15dcbc0…

MALICIOUS

PDF

82.0 KB Created: 2021-02-28 15:09:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 3a23148063c404958f36fdb88aec5fb9 SHA-1: 6a7ad3e4cd64d486c11f7f6984abc7fc5d8091f7 SHA-256: 3b14f30ae15dcbc00ba0c38b20f80b735e518b6a1075c70b1d8246cab2b26af0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm hosted on disposable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users through deceptive links.

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 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://baarspo.ru/wb?keyword=kenwood%20kdc-248u%20reset%20button PDF link annotation
    • https://fojumujitugesi.weebly.com/uploads/1/3/4/6/134688065/9368234.pdfIn PDF document text
    • http://vabakavolageni.22web.org/arthrosis_deformans_oorzaken.pdfIn PDF document text
    • https://mapivabivex.weebly.com/uploads/1/3/0/7/130776319/7471601.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382949/normal_601baffa78650.pdfIn PDF document text
    • http://wopazav.22web.org/32190466223.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449629/normal_600237c12f2bf.pdfIn PDF document text
    • http://zotusomadelisok.22web.org/dka_guideline_facebook.pdfIn PDF document text
    • http://moderivapotilos.22web.org/lugovoposatatimisezevu.pdfIn PDF document text
    • https://tugalebuwe.weebly.com/uploads/1/3/4/0/134012885/rozejutirerosezefixo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375716/normal_5fe16dc53d23e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kirotomi.epizy.com/form_for_lost_passport.pdfIn PDF document text
    • http://xivajaraseb.rf.gd/fopenorexexaluti.pdfIn PDF document text
    • http://masomivi.rf.gd/76343275942.pdfIn PDF document text
    • http://nadilafirot.rf.gd/presonus_studiolive_16.4.2_price.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42C 5236 bytes
SHA-256: 32641e81888d20c036035db529d36ea19662b33d7f40f81f4ab8ce9d7f15674d
font_01_sfnt_off00010627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10627 11888 bytes
SHA-256: 1db9c7092ea8fa92c9a01926dcd8d69eb30d2033ce9ad96078c6f6e0f773255c
font_02_sfnt_off00012d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D51 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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