Malicious PDF — malware analysis report

Static analysis result for SHA-256 31a914dad61b94bb…

MALICIOUS

PDF

80.9 KB Created: 2021-09-15 22:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4fdc8998aa7bf8a4b78954ac0bebd9c0 SHA-1: 96af0f404409ad5e9bbb5f2d53f6f0c5db3a09db SHA-256: 31a914dad61b94bb486651566af2c088552786c5fb276b91b09452b31962089f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a large number of embedded URLs, many pointing to potentially disposable domains, suggesting a link farm or redirection scheme. The presence of numerous links, including one identified as a 'link farm on disposable hosting', strongly indicates an attempt to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://cdmatik.com/uploads/file/joxepusejomabevonakuf.pdf In PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/mokipenupadugisurud.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/47434380103.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/5574486634.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210913195735200.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/mizar.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/47266843783.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/mofabuka.pdfIn PDF document text
    • http://ttc-investco.com/img/files/fekupajuvigurudidodojab.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/sazofimowa.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/98105890454.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/41733896835.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/11638221763.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9563df14f---57632505751.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/35629154013.pdfIn PDF document text
    • http://nensi.si/upload/file/88871849740.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/60817886052.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/bijegobitipegujuso.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/av688jhl1dadg2b7ff89us3s64/vesagetesi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=places+to+watch+anime+onlinePDF 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

Related samples 6

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF0 10480 bytes
SHA-256: 2572e8fd11cdcd123937969d02398953097d111bfd1b5d75add54ab2d100388f
font_02_sfnt_off0001079e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079E 18068 bytes
SHA-256: 6a9e4a4bd5036b98a18dc47d40b492dc62eca70e3ae65390d60e4fc1d6fc8386

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