Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbece138ae81b353…

MALICIOUS

PDF

85.9 KB Created: 2021-09-15 20:36:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c4ef3d91e4b671683ad3ce0d983a3bc9 SHA-1: aa1dcd2a227e9baab25f330d3d628e5007f0076c SHA-256: fbece138ae81b353bd5d6a81032cfd92174b96506be9188ebffe4a88898cd92c
166 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a link farm and an advance-fee scam lure. The document body, though heavily obfuscated, suggests it's part of a scheme to trick users into downloading further malicious content, likely via the embedded URLs. The presence of numerous external URIs and the nature of the heuristics strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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=app+to+download+web+series+free
    • http://tbeaindia.com/userfiles/file/selesab.pdf
    • https://bibonatura.com/ckfinder/userfiles/files/53101247190.pdf
    • http://dijladentalcenter-qa.com/userfiles/file/gugabekofedadeforitaxok.pdf
    • https://geloracinta.com/contents/files/munarupoxusevuwewovopax.pdf
    • https://sakesushimn.com/userfiles/files/jaxumozigipamado.pdf
    • https://rdsdealers.com/ckfinder/userfiles/files/43849709828.pdf
    • http://prmakeup.com/Image/files/jupitisazosilasigat.pdf
    • http://koutingchina.com/upload/files/17539409266.pdf
    • https://exam11.menapoint.com/app/webroot/upload/files/rakuna.pdf
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/lukusometutapatidokuje.pdf
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/99291400243.pdf
    • http://velo.hu/UserFiles/file/xiluxarezol.pdf
    • http://candemdientu.com/Images_upload/files/fozetemafit.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/45fb94dd2ba608ff7e10d42edd2fd120/48111597288.pdf
    • https://mandarinkinesiska.com/userfiles/file/fekurezijel.pdf
    • https://kirmatas.com/userfiles/file/96975862663.pdf
    • http://thietbibepnhahang.net/media/files/sibovaxizomidijiwir.pdf
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6481087982.pdf
    • http://techbis.pl/files/file/72476668953.pdf
    • https://jogamiskolc.hu/ckfinder/userfiles/files/wufomalirogonu.pdf
    • http://alrehabourhome.com/userfiles/files/gadepowipazasixovijebal.pdf
    • http://perlawarmii.pl/userfiles/file/jakurike.pdf
    • http://tcsklife.com/filespath/files/20210913030932.pdf
    • http://baodieptailor.com/uploads/2021-09-09/images/files/90684410281.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/fuxazevepuvoxozegekus.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb27.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB27 16792 bytes
font_01_sfnt_off0001033e.bin
9e134e1249bd73458042f511b0ef4bd0d8503bce3ba0aababdc853540e2f0c26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1033E 10696 bytes
font_02_sfnt_off00011bc1.bin
7c4d44f53ef59de6b96ea6d0951172dcdb6def8a5bfd3036b969ebd5f558d40e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC1 17948 bytes

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