Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea5957173dd01d27…

MALICIOUS

PDF

69.5 KB Created: 2021-09-25 15:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c10e8a3668713fa40809926e804d298 SHA-1: 006c07a291c34bcdcf21e8281d8e56385b23b236 SHA-256: ea5957173dd01d27f0dc67bd70e38fdf8f16694a3b2703dcf920f5e742690210
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. Heuristics indicate it's an image-only document with a clickable action that redirects to external URLs, typical for phishing or malware distribution. The presence of numerous external URIs, including a link farm on disposable hosting, further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://huntic.ru/uplcv?utm_term=net+framework+4.5+windows+10
    • https://boyanbolyarski.com/userfiles/file/23687390883.pdf
    • http://keramann.ru/uploads/files/5597700166.pdf
    • http://st-johnson.com/Uploadfiles/files/ruribu.pdf
    • https://kubermatkaplay.com/ckfinder/userfiles/files/24489396543.pdf
    • http://inspiredindianfoundation.org/uploads/joxajovekemeretoratato.pdf
    • http://toroisg.com/public/images/files/vimorowato.pdf
    • http://www.jindatunnel.com/up_files/file/fimegajubekaxala.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/6536b7d853bc3de6205fecfb6fab9f3b/53928892442.pdf
    • https://anbc31.iscriptscloud.com/app/webroot/files/file/83082751964.pdf
    • http://studioprogettoarchitettura.eu/userfiles/files/tibukesojakitejulajaduna.pdf
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/vimejodugoxigi.pdf
    • http://divodizain.ru/ckfinder/userfiles/files/kodefator.pdf
    • http://fizjoactiv.eu/Upload/file/vidupabotogelatimov.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/19b089ea4a97b60f6a235dbcc3400cc6/5067154557.pdf
    • http://yugreat.com/filespath/files/20210921144319.pdf
    • http://tangneylaw.com/admin/images/file/bisukukub.pdf
    • http://cosonhuath.com/hinhanh_fckeditor/file/55852859722.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/gekenutefivabebotiwa.pdf
    • http://mycoapaisyl.com/webimages/files/82421250322.pdf
    • http://ymmicro.com/files/files/67798231345.pdf
    • http://nicenpos.com/userData/board/file/55278831585.pdf
    • http://yogaschoolofkerala.com/photos/editor/files/70905942264.pdf
    • https://jackinthegymtpe.com/uploads/files/202109110707453612.pdf
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/72637877923.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_off0000b32c.bin
c585d66a25c59743946bc288372b04a261d0d4e3803667647fafd2df839c7ab2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB32C 11076 bytes
font_01_sfnt_off0000cd2e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2E 16792 bytes
font_02_sfnt_off0000e540.bin
3b9d79a442c3a009dfa6150147852f6eb66a24d0bae80799297d4126c99ee19d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE540 14072 bytes

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