Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ef48f6fb2ffa28…

MALICIOUS

PDF

81.0 KB Created: 2021-09-11 08:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fa9cfae4973b93ec3cf4f3ae7d05bcc9 SHA-1: 46d620f2aa1730b023036a09adc24e8c274fea96 SHA-256: 82ef48f6fb2ffa28e8be0f3955e48a5b97f9ac572124b9fdaa3f79cd74d3e62f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://sinproval.it/userfiles/files/3362710651.pdf In PDF document text
    • http://uralinteh.com/uploads/files/85294774417.pdfIn PDF document text
    • http://vinmexindia.com/uploads/71438954726.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/15377646319.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/fapezelemil.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/mixalol.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/16826074043.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/75524778805.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/jepuwodozul.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/a5080b7562e3cb22a6ca0f36e1898ca6/57083276952.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/nepakevijotiv.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/lolijobapimalonekaged.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/kamigepupirekikijomidiz.pdfIn PDF document text
    • http://strahyi.ru/images/file/37745782059.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/kupal.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/3746503264.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/1406600135.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137be7454819---gifuvada.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/79429470523.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/wasizesutimun.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/33682128294.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/80493899374.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=password+gta+psPDF 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_off0000dab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB5 10280 bytes
SHA-256: 6fe643c32a000fd4ca368caa84335ac2f8f89995bbdd8d95744c3a771fb13521
font_01_sfnt_off0000f1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D0 17456 bytes
SHA-256: 9c29eb88c460b6521800c81155d4cabd93a6c79f6519bbc0d04d0fb734067301
font_02_sfnt_off00011f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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