Malicious PDF — malware analysis report

Static analysis result for SHA-256 c767f0ecc5faec32…

MALICIOUS

PDF

77.0 KB Created: 2021-04-13 10:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e27e43799a06c2a8bf9cfa60bc3c96e2 SHA-1: 11ff0baf76689970175e99c3f22228126ad46e3d SHA-256: c767f0ecc5faec321925e54de85b819da76f945bb67f5eb8ef55278b5554e411
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF containing a large number of external links, identified as a PDF link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or hosting malware. While no scripts were directly extracted, the PDF structure and embedded links suggest it is designed to redirect users to potentially harmful content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=waterway+sand+filter+drain+cap
    • https://cdn.sqhk.co/liwewajawab/hghjghj/goblin_character_sheet_5e.pdf
    • https://cdn.sqhk.co/dubibuwa/ighdj5U/26443576865.pdf
    • https://wodumipanopova.weebly.com/uploads/1/3/4/7/134731655/wilegokovobo.pdf
    • https://rusizatigaj.weebly.com/uploads/1/3/4/0/134041601/6646226.pdf
    • https://cdn.sqhk.co/kixagixupo/cmidkha/power_rangers_legacy_wars_obb_download.pdf
    • https://cdn.sqhk.co/doburazax/pek0Tt1/christian_songs_telugu.pdf
    • https://cdn.sqhk.co/nokotadi/engiTg5/launch_11_knife.pdf
    • https://niritopep.weebly.com/uploads/1/3/4/6/134634222/ganonomoja.pdf
    • https://cdn.sqhk.co/nupegefozub/I3cidid/siladatix.pdf
    • https://cdn.sqhk.co/tawavumazo/jejdPjd/55026469793.pdf
    • https://cdn.sqhk.co/sabumijobude/iWgjfjd/31180276477.pdf
    • https://cdn.sqhk.co/wufevinek/oajjG2n/33021927324.pdf
    • https://dusitibepilezu.weebly.com/uploads/1/3/1/4/131437978/ruwovezejedi-zokisetetaku-saruvixosibamog-revoxikagal.pdf
    • https://cdn.sqhk.co/busibelifiv/gu9icoM/83511243481.pdf
    • http://meetdouche.xyz/33790510097htzvr.pdf
    • http://islemleriniz.org/xepivowomunemome4d9m8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/dakebesuvum/flamingo_drawing_template.pdf
    • https://s3.amazonaws.com/jezobasit/leed_core_concepts_guide_version_3.pdf
    • https://s3.amazonaws.com/lusabifef/turumemobili.pdf
    • https://s3.amazonaws.com/fusidejebi/bounded_sequence.pdf
    • https://s3.amazonaws.com/vefagotoje/nujeloren.pdf
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4d0.bin
7dfcb51ad4a571a4ff6069cfeb6b0f9f23c7f86d940b93c324a20b5c822301a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D0 5032 bytes
font_01_sfnt_off0000f615.bin
da70e5256b778817caa9e5114e3d834cc161aa622839606f74e110a9a7788f31		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF615 10044 bytes
font_02_sfnt_off00011876.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11876 4324 bytes

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