Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6fb32f2bffc78ee…

MALICIOUS

PDF

69.0 KB Created: 2021-09-30 10:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9976f0b3914f5927ec1151fb8ad72db4 SHA-1: 15fc6835fbe368e5c62207489cfb7ccfbd178ccf SHA-256: a6fb32f2bffc78eea9367edfd467f817358c9c1d4629e3cc6dd777b2a2f82ad3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to a link farm, suggesting a tactic to manipulate search engine results or distribute additional malicious files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://tzsunup.com/upload/39861469856.pdf In PDF document text
    • http://shopphutungmayphat.com/upload/img/files/jegabevum.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/figebejuzukefiboxaw.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/74887437697.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/gasabozukadibilud.pdfIn PDF document text
    • https://korankertas.com/contents/files/piroroxifiwerelaxubegofax.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/69577672729.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/38897332510.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/20489227656.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/notejufireg.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/xusamiwupaxux.pdfIn PDF document text
    • http://szm.hu/userfiles/file/81904167450.pdfIn PDF document text
    • http://tartak-monis.pl/tartak/images/file/xoref.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/71667028507.pdfIn PDF document text
    • https://atavio.ru/files/file/10833063024.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/dinemakunat.pdfIn PDF document text
    • https://supermovi.com/userfiles/files/82722053751.pdfIn PDF document text
    • http://www.pilartangguh.com/file/latoluladumal.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/6332246909.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///96652005359.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/87553547479.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/dolagukano.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/sibijuxaxupav.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/93367413695.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/17677814713.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=positive+words+starting+with+the+letter+yPDF 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_off0000af99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AB 15056 bytes
SHA-256: 34b291a86b8928395900d7819bd71177f2cfcbcc65948b477187efb05311d3b1
font_02_sfnt_off0000ed72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED72 10796 bytes
SHA-256: aa7e9edf823c07934a991ebd6504f14bfb6b8836a44828fbb00d5795e43323f6

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