Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8749e7d9efb103…

MALICIOUS

PDF

76.0 KB Created: 2021-09-16 10:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bc2cac6cd0ea699ae34a18a9b58ec2d3 SHA-1: d0ef744881113fef89184c0d3d045ce39d1eaf36 SHA-256: 3f8749e7d9efb103a1ea1be1784b5fb5554d7a2997318258f60ab2200430a023
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF that has been flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm and employs a social engineering lure to trick users into installing browser-related software. The embedded URLs likely lead to further malicious content or downloads, contributing to a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://chinazzjx.com/d/files/niwekojujomufuvurinu.pdf In PDF document text
    • http://karinameal.com/imgdish/files/14043463200.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/99660453769.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/wukuvenefopasoj.pdfIn PDF document text
    • http://ctm.it/userfiles/file/32007807499.pdfIn PDF document text
    • http://gr-chem.com/upload/files/janezotugifakodiwadaj.pdfIn PDF document text
    • http://tulga.ru/editor/files/dabale.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614038d114491---daxidodupoxufujemu.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/nawakewejapa.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/vowasizez.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/30539343564.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/naxanesigofuvi.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16136d4e0c9d24---25247925037.pdfIn PDF document text
    • https://lordoptika.hu/files/files/pokabifukotimibi.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/benodeperurux.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/vapofafibufinuzaxukugem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=remove+mdm+androidPDF 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_off0000c6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000decd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECD 10208 bytes
SHA-256: 8b174aa4ebbd5a31928022adf2d51916e42614b087e8da04d682a5b6dcb9e7cb
font_02_sfnt_off0000f5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A0 17624 bytes
SHA-256: ac0a7e604d6349d30c04583ad3800f297f89cb0aa8d15d735286881503138b46

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