Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2a8791d13d19c36…

MALICIOUS

PDF

85.0 KB Created: 2021-03-31 14:31:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 876e2f67fa7ecfd73444b0e58032aea5 SHA-1: 789e4c2d2ecd168e62efda8e3b8c1629fe9d5cca SHA-256: c2a8791d13d19c368abe7f4bee3daf43796354df3beccecaa93a1d905c004791
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it is part of a link farm designed to distribute malicious content or phish users. The document body, though heavily obfuscated, contains metadata related to 'fishing report' and 'wkhtmltopdf', hinting at a lure to external malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/123?utm_term=fishing+report+port+washington+wisconsin
    • https://cdn.sqhk.co/rikopekela/jFBGX7M/funny_road_rage_videos_youtube.pdf
    • https://cdn-cms.f-static.net/uploads/4370778/normal_60319ad3b7dce.pdf
    • https://komiwafaka.weebly.com/uploads/1/3/2/7/132712661/ruweratapimefeda.pdf
    • https://cdn.sqhk.co/zojoguxuban/cwlfN3R/pixel_gun_apocalypse_2_unblocked_66.pdf
    • https://fekakawe.weebly.com/uploads/1/3/1/4/131437222/7898038.pdf
    • https://static.s123-cdn-static.com/uploads/4492240/normal_5fe103e70b532.pdf
    • https://cdn.sqhk.co/madagijoj/7Pq6BXV/harris_teeter_jobs_login.pdf
    • https://tanuroxej.weebly.com/uploads/1/3/4/1/134131309/bevidaxake_rirapuw_xovita_vagogugunovosan.pdf
    • https://cdn.sqhk.co/bivadudit/higjjgf/clumsy_cat_mod_apk.pdf
    • http://sevoxotedeki.medianewsonline.com/bidart_campos_tomo_1.pdf
    • https://cdn-cms.f-static.net/uploads/4482848/normal_6053da4041d00.pdf
    • https://cdn-cms.f-static.net/uploads/4500669/normal_603a02f0c56bb.pdf
    • https://cdn-cms.f-static.net/uploads/4479710/normal_6026a61ae3032.pdf
    • http://pakupuxojopef.getenjoyment.net/zejibatesedetaka.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/67384af1-493c-4d97-acdf-ef598a4a699c/wazatevomitoj.pdf
    • https://s3.amazonaws.com/sowewazulejewi/wefelamud.pdf
    • https://uploads.strikinglycdn.com/files/bedefd3d-8894-44a2-bd11-3dd5c7fcb855/jivozutalifomegedifa.pdf
    • https://s3.amazonaws.com/firigugixujotov/jikizejepunekikexapi.pdf
    • https://uploads.strikinglycdn.com/files/1d1ab6b3-47a5-4f62-bcf0-5f98a202f710/how_to_use_apc_ups_650.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e42.bin
3021ba1b912a7001b1246bb9ef2f333b0e910c5baa64b4615f3d0379fed8eaf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E42 5212 bytes
font_01_sfnt_off0001200f.bin
9fcc9015321d36bfc3cf5f400df608846848ae239bce4245b8b19adfc0be4a79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1200F 11248 bytes

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