Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f35cfee8fe89103…

MALICIOUS

PDF

81.0 KB Created: 2021-09-16 10:28:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ba6e70f23618393e01d3b04ceda3b099 SHA-1: b0d36d0a8485c01bf28f7929b71afbc8746deb16 SHA-256: 3f35cfee8fe89103ede4ed7f629bfe99bc281eca6e5f1a3ed2360e7070e04f80
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the PDF is part of a link farm designed to redirect users to potentially harmful sites. No scripts were extracted, but the presence of external URIs and the link farm heuristic strongly suggest a phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://allytemp.ru/uplcv?utm_term=ringtone+terbaik+2020 PDF link annotation
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/94637637187.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/35047319124.pdfIn PDF document text
    • http://idcla.net/upload/files/73771311817.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/rhrnp88144chg689ddpnc1fed3/45191376924.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/21823854749.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/44379111735.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/paletenizuvapufilugagit.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/3879642974.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/54666553438.pdfIn PDF document text
    • https://olterus.org/contents/files/lenumelozaseluwur.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/85014503094.pdfIn PDF document text
    • https://andana.us/files/files/65438448544.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/86571669460.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/48947495670.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/66914895241.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/mavubogavovem.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/sakopezolesobodeko.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/36963256929.pdfIn PDF document text
    • http://elskenecologie.nl/files/39522861798.pdfIn PDF document text
    • https://ismart99.net/upload/files/kofegupudig.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/79663316182.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CE 10588 bytes
SHA-256: 209e079417fc67ab98aa3dc653add47b01ad5d77fd8d526aed36d0f670543b15
font_02_sfnt_off00010b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B19 16772 bytes
SHA-256: 7f0b7135e3f56a4cb047e6afc7660717741067de3faebd64bf94159a8c732409

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