Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca16edf977a00fc6…

MALICIOUS

PDF

80.7 KB Created: 2021-09-13 04:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0ac81967e6845be9700c48bf3323e930 SHA-1: 165bf16c9818a2f97e7fffad44b63badba509214 SHA-256: ca16edf977a00fc69efdd01af3e4f034b3276a2490bdf407fb96bad2c896a618
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are likely part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the final malicious destination. While no scripts were explicitly extracted, the presence of numerous external URIs suggests the document's primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://krisoc.ru/uplcv?utm_term=how+to+download+vlc+player+on+firestick PDF link annotation
    • http://protectakoteasia.com/ckfinder/userfiles/files/48411695692.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/20485334682.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/92250310968.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/94362561302.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/beff6da774c08d152c082bb5a466270e/juwumorokakoluxujamezina.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210909065502_1240899602.pdfIn PDF document text
    • http://makaroma.fr/upload/file/wejovevorevedow.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/dunofifewa.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/45577145089.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/wawolewalepafidopuw.pdfIn PDF document text
    • http://apart1day.ru/file/43133473339.pdfIn PDF document text
    • http://contelex.it/userfiles/files/81306195715.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/mobonuwovutezuvawe.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/11006672481.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/51824112351.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/85329614651.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5f88eba64---tatukazimatavamewazoroko.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/80859094732.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/pixuremed.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/63593372828.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/67495332913.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/felemadazezazam.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/84786560798.pdfIn PDF document text
    • 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_off0000d78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78F 16760 bytes
SHA-256: 68247c280d258786e7ef33ea3967e483ea93c297ad64383c1675fecfcd645899
font_01_sfnt_off00010347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10347 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5E 10964 bytes
SHA-256: 1e166d0f1d5c3a1ee8e14becaa73616c3302c5883e1d231cacc0ba63385b0872

Open this report in the interactive analyzer, or submit your own file for analysis.