Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f9c24a613a35764…

MALICIOUS

PDF

81.3 KB Created: 2021-09-15 13:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9bda0327e5805ea64dd844d7dd009d4f SHA-1: ee490b29a0c92dc7730ef6c2412ce35c2185cb9a SHA-256: 1f9c24a613a35764102d75abd7a813eacb78f2e036d96ac0585bc3973c0a0a9c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious content, likely a phishing or trojan payload. Although no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to trick users into downloading further malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=penguin+tamil+movie+download+isaimini PDF link annotation
    • http://getem.eu/files/file/senuzoxanosovekapolem.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/jenejasow.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/83420953496.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/3506292156.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/97063145896.pdfIn PDF document text
    • http://trubaopt.ru/content/file/88702242965.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/mogesodiru.pdfIn PDF document text
    • https://maturana.cl/upload/file/43885209684.pdfIn PDF document text
    • https://recrut.com/files/files/25948115221.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/laruxekudibaxasokewili.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/jitokaxuwezixoras.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db272e181e---40483506362.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/24696239543.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/vemogadogivamadonasulibu.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/15554422.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/zaforulinunagujeketasote.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/javukosefagajomok.pdfIn PDF document text
    • http://alocainghien.com/uploads/userfiles/file/40756285935.pdfIn PDF document text
    • http://cutskytools.com/d/files/zumopedotepakem.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/rrevdldb3mjp2t48431ubujo28/49613298065.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/71136158266.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_off0000da0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0D 17692 bytes
SHA-256: cb8e57c37c2692a8c12148cf82c9f5cb031863c1ddbf5b23045670e2e375d235
font_01_sfnt_off00010757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10757 10744 bytes
SHA-256: b0f12e6e751470fc61e5c65f0688ed4459355949768bb9d2697f49b79afcf017
font_02_sfnt_off00011fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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