Malicious PDF — malware analysis report

Static analysis result for SHA-256 cca0934082e85e3f…

MALICIOUS

PDF

71.7 KB Created: 2021-09-10 23:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 641c14af19a0b404fc103ff5c8dadfa1 SHA-1: 337bec43507e66427fb70947644e5cfe4f16411f SHA-256: cca0934082e85e3f5f384c744ad1254ee1db950a0e1acc448437362ea27327cc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a high ML score and ClamAV detection, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it is part of a link farm designed to manipulate search engine results or distribute further content. While no scripts were explicitly extracted, the presence of numerous embedded URLs pointing to other PDF files supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://tahubunting1.com/contents/files/98531297880.pdf In PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/31047558687.pdfIn PDF document text
    • http://jucal.es/images/file/sasafovurelivezeravimuxeg.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/31055211832.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613419656ad64---lizelogepesoladijenobode.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/26084762902.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/fivome.pdfIn PDF document text
    • https://tebra.si/userfiles/file/kibejubakifukobubigeseva.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/loruxadubigijuwi.pdfIn PDF document text
    • https://newfrio.com/userfiles/files/nuzewakikokatubudufotubi.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///96794069704.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/23907515127.pdfIn PDF document text
    • http://zl369.net/userfiles/file/sizera.pdfIn PDF document text
    • http://cecev.com/stockages/files/86263942667.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/vopozux.pdfIn PDF document text
    • https://raljob.com/userfiles/file/6646838611.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/93871142791.pdfIn PDF document text
    • https://polandpools.com/contents/files/sigerenuxorapo.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/xedoboken.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/wavupez.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/pifobomotuwasok.pdfIn PDF document text
    • http://didula.ru/img/file/ganewa.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/93932958489.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/93384127525.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210907211026_brfmsu.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/radipizagufoxabiretufowal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=castle+seed+minecraft+xbox+onePDF 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_off0000b7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7BD 15696 bytes
SHA-256: ec848d798c178f427e8aafecb519edb7e0670d009a334c62b907a0ecad4ad1b4
font_01_sfnt_off0000df85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79C 10912 bytes
SHA-256: f442e7232ab58747fdb6f55c9f3f664ee63fa2166cce193a0254c48c45a5ac90

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