Malicious PDF — malware analysis report

Static analysis result for SHA-256 641ef0b35247ccfc…

MALICIOUS

PDF

70.7 KB Created: 2021-09-29 02:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 000300a99a1fb0f43d1a220bb9c05e62 SHA-1: d59961cdfd48cd9e9b4eaf0f1d49e741b7fb32d3 SHA-256: 641ef0b35247ccfc8529542c209dcb888b3f3092849f5b94fc49cf3e91d9257d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to suspicious domains, and a heuristic identified it as a link farm on disposable hosting. ClamAV and an ML classifier also flagged the file as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the nature of the embedded links suggests an intent to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://oniceh.ru/uplcv?utm_term=how+to+log+out+messenger+android PDF link annotation
    • http://bekkercoon.ru/ckfinder/userfiles/files/77155917925.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/nerirurivipi.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/70641243348.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/91907337136.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/zigatejiminudakafe.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/48029981874.pdfIn PDF document text
    • https://penal-garazh.ru/files/27897443108.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9c54058a9---dizone.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/wasam.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/38239808456.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109071027316751.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/kofegevivu.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/wexorefuwawileronutamogaf.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/mefeguvugusexumapixite.pdfIn PDF document text
    • http://cutskytools.com/d/files/luzopakemixuxitovo.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/rumogarujunemetazifekat.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/peruzofij.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/vigasonuxizomazuse.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_off0000ae94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE94 18120 bytes
SHA-256: c9c5d8f192c9ebaa1e69c772ee18ac6c4b114e00b134eddd3da8c6086c026830
font_01_sfnt_off0000dcbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D5 10768 bytes
SHA-256: 566ca8e4b73190113dde8bf350dcda91c11e92f45e79dc17dad39b3f8430f6d6

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