Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fafe7e5a5b36880…

MALICIOUS

PDF

69.1 KB Created: 2021-10-16 19:30:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 02761af9742a4130a0b31dc45464f10a SHA-1: 358c1af3ff67da92ca386da75e8de3a2e28f18d9 SHA-256: 5fafe7e5a5b368807487fcc318d00fe0559a428c4d545d9908d1f76ae4acca74
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct domains, many of which are likely disposable. The embedded URLs, despite some being marked benign, contribute to the overall suspicious nature of the document's intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://barudan.hk/UploadFile/file/20211010010531188.pdf In PDF document text
    • https://cowik.pl/upload/98587250360.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/72912634436.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/movofet.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/paviwuzif.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/54307516608.pdfIn PDF document text
    • http://ktcz.eu/files/files/pejawufulurakejojoteze.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/u5qkr98duq9mcaclv1r3v7m5ka/75701689018.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16162c64bdbf87---durijufojeduboparive.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/mipolomugenev.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/xidifa.pdfIn PDF document text
    • http://handmade.sdelaemlegko.ru/files/userfiles/files/boneraxomogewu.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/80102299073.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/74430109619.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/18911264705.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/wamunelozego.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/80960420154.pdfIn PDF document text
    • http://lecostationery.com/files/file/56748193575.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/84570798484.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20211016070614_0zeoae.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/sotabawapipenegaboni.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/5111220277.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/1hHberoKktI/uplcv?utm_term=identity+culture+and+societyPDF 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_off0000b1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F3 10528 bytes
SHA-256: 4683d4c29ae67cb9a73badb63362b22ff9530e29ce649097ef7c20beba704368
font_02_sfnt_off0000e20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20F 15020 bytes
SHA-256: 1c1edd8d941ad42cba942e4f62be40f7e6de42c9e8a97df7cc7696f0f602a41f

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