Malicious PDF — malware analysis report

Static analysis result for SHA-256 a914a654dbe5c97b…

MALICIOUS

PDF

82.7 KB Created: 2021-09-10 20:36:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c910a810891b1810dec29bb41d95bf52 SHA-1: 384e2f923eeabbfddde96969548332739d4bf6c0 SHA-256: a914a654dbe5c97bff1de2d266f60a04334f7bdfe6c3dc4e28315005f90699c8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs pointing to other PDF files hosted on various domains, likely to obscure the true malicious destination. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying it as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://bangdientunhk.com/upload/files/bokonodisilazetabujofepe.pdf In PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/juputowunodokebafegesiz.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/72204706008.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/fabikijugugavi.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/52994741432.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/25563687832.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/xotigajevoka.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/fiveruletuvelaferofut.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/20883519746.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/popozepulizi.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/41193970863.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/54708367090.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/75245216746.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210906171501.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/22322489930.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/33801964806.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/dizugazatix.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/mujadelole.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/bawekubetexeletunowurofet.pdfIn PDF document text
    • http://davcpundri.com/css/file/kidexe.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/68777463562.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=baras+rizal+zip+codePDF link annotation
    • 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_off0000decc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECC 10420 bytes
SHA-256: a72100186faf861717ef6f799123f55c21f4acdfb6444e70ff834f60f3d8f647
font_01_sfnt_off0000f688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF688 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9A 17836 bytes
SHA-256: 89773085afe9d6a2f3445ebbfdf8dfdfb7f2a6d0ac2a36144b5ab021b09c7086

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