Malicious PDF — malware analysis report

Static analysis result for SHA-256 10ff5eaaf629bbca…

MALICIOUS

PDF

82.9 KB Created: 2021-09-17 14:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dc8ef6906bc90c4cf12166d2a3602f03 SHA-1: 5f980222186fcfbfeed502d4ef11a54256882247 SHA-256: 10ff5eaaf629bbca4b1f0ccd4ea4a86109df8a6108ff875917076ef702b2a0a3
146 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The PDF contains numerous external URIs, many pointing to disposable hosting domains, suggesting it acts as a lure to a site that likely serves a second-stage payload. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm on disposable hosting. While no scripts were directly extracted, the nature of the PDF and its numerous links suggest it is designed to exploit vulnerabilities or trick the user into downloading further malware.

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://labuchedeberce.fr/userfiles/file/92473642136.pdf In PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/besozotiremupubagejaxij.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/nenisegiferewudig.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/referutidufo.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/68152333400.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/xamagobizar.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/desul.pdfIn PDF document text
    • http://beta-rc.com/upload/files/luvulirumulajexuj.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613d15b9ecf32---31383292167.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/65688083443.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/37965324106.pdfIn PDF document text
    • http://rayer.cn/d/files/fepudasakuveveba.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16140bca25bd8c---20396592228.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/25400203090.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/65844838537.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/2011873949.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/bunatuped.pdfIn PDF document text
    • https://satesayap.com/contents/files/fovifotin.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c633aea8ff---28662251328.pdfPDF link annotation
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/66490197265.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff04f277b1---rupizegutarolo.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90988170154.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/71744832784.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/12010555569.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/begosegapudamaforibudabib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=stree+full+movie+download+pagalworld+mp4PDF 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_off0000de62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF674 17576 bytes
SHA-256: fe2392b70bbda67429ee3ba153ac4eec870fe71a8d355d078ff905cc6fd15176
font_02_sfnt_off0001241c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241C 11080 bytes
SHA-256: 4a10cf9e60e015b35f3c243409818a5c3edaafec0b73dbf5672193f03eab145a