Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e5dca130239c7d8…

MALICIOUS

PDF

81.7 KB Created: 2021-09-21 12:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 87a011a8b1847ab2232ecfe01c4a598c SHA-1: deb68adafa33075351f64fcbda06e91069985b44 SHA-256: 9e5dca130239c7d8e47663e895a8431e74251103379d6b40b6704fdf1093c8b9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external files, with many hosted on disposable domains, indicating a link farm designed to trick users into downloading malware. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://ficfart.org/userfiles/file/teloponu.pdf
    • https://greenbins.ca/ckfinder/userfiles/files/revatoxaveza.pdf
    • https://laps.pl/userfiles/file/65436740580.pdf
    • https://fentesmakina.com/paket/upload/files/fabagulupi.pdf
    • http://canshu.dlzj.net/upload/files/20210910183628401590.pdf
    • http://bancasemecanino.com/userfiles/files/wotofogezulona.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1613eef0ce1a54---xaxuribevaxiserisubav.pdf
    • http://clinicaveterinariabilancino.it/userfiles/files/demamakefabubajubazil.pdf
    • http://retailcop.ca/files/pejubokoxigivanobamumuj.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614046cb60ef7---tedofefisujoxete.pdf
    • http://mim2010.ru/userfiles/file/tujevimokesolotiju.pdf
    • https://afayl.com/userfiles/file/73743783920.pdf
    • http://ingatlantv.tv/userfiles/files/dufof.pdf
    • http://3bbb.fr/ckeditor/upload/files/32566262953.pdf
    • https://unaizahic.com/Files/files/75432982566.pdf
    • http://caopump.com/admin/userfiles/file/48140882884.pdf
    • http://synphabase.ch/upload/file/tevusezafi.pdf
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65010954149.pdf
    • https://rh-h1tapi-turbo.com/contents/files/85135049473.pdf
    • http://naphogacomposite.com/upload/files/71653584870.pdf
    • http://phucuongplus.com/upload/files/27278477644.pdf
    • https://kipass.fr/userfiles/file/47081062166.pdf
    • https://maconlux.lu/userfiles/files/55150707850.pdf
    • https://samudra99.com/contents/files/sotojineka.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=visual+voicemail+apk
    • 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_off0000da9e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9E 16792 bytes
font_01_sfnt_off0000f2b5.bin
613c32c1417e6a6630dd85bcb3014e3609f7f112bd3e5b276a93fb94104b0b36		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B5 10460 bytes
font_02_sfnt_off00010a7f.bin
6be717c64cd65f7194512c2e3be611e6e4e3cc895db82f6eb4f2ef4308213d6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7F 17756 bytes

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