Malicious PDF — malware analysis report

Static analysis result for SHA-256 324d4913605e866c…

MALICIOUS

PDF

73.7 KB Created: 2021-05-07 19:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0543e767f45dff63169ffce2d3d6964 SHA-1: b8b9392f888638516555b87020b51efdeb165cb1 SHA-256: 324d4913605e866ccfb0ea1ae4c85e71ddaa53dab3c8cd9b19fa411aac1c16bd
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, forming a link farm, and is flagged by ClamAV as a phishing trojan. The embedded content, though heavily obfuscated, suggests an attempt to disguise malicious links as legitimate search results. The primary attack vector appears to be directing users to external sites that likely host further malicious content or phishing pages.

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://kuzutuzo.ru/strik?utm_term=what+type+of+oil+does+a+2005+grand+caravan+take
    • https://dovabobu.weebly.com/uploads/1/3/5/9/135978637/c7812e362d8d34c.pdf
    • https://cdn.sqhk.co/ladesajisama/ghhhjbl/2_forms_of_government_issued_identification.pdf
    • https://cdn.sqhk.co/tisewesir/mDnhajc/dibopu.pdf
    • https://cdn.sqhk.co/jeforije/Pjfjahg/vitamin_b12_shots_cost.pdf
    • https://cdn.sqhk.co/jivobukafon/hiiaiel/grand_launcher_big_launcher_for_seniors.pdf
    • https://cdn.sqhk.co/wujejelot/5Vib8UQ/63545368843.pdf
    • https://cdn.sqhk.co/libobivole/NyCgfUm/xagoduwevuk.pdf
    • https://cdn.sqhk.co/letareximo/hbgijgc/nurafaza.pdf
    • https://cdn.sqhk.co/kogeledewafo/bhe7VHN/fly_little_bird_fly_poem.pdf
    • https://cdn.sqhk.co/fedijadika/hbVhdoU/final_fantasy_xiv_goldsmithing_leveling_guide.pdf
    • https://govonomuvilikiw.weebly.com/uploads/1/3/4/6/134620083/bijojepe.pdf
    • https://cdn.sqhk.co/dajuzafum/fr1iAgg/50243324932.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b7b9a0d4-d71d-433a-9dbc-8293b1c729aa.filesusr.com/ugd/979434_e08619dc95004e2cb609da090f0fb494.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a7dbfa20-faa9-4340-b9bc-6655851a79bb/how_to_service_a_kirby_vacuum_cleaner.pdf
    • https://uploads.strikinglycdn.com/files/0ae592ef-71cc-4d3e-90fb-e34700bc6c48/9716557071.pdf
    • https://5984e891-aecd-43e6-866f-efdb297c9c35.filesusr.com/ugd/403565_dd866587475f429080f79f07df3ab97b.pdf?index=true
    • https://a04ad255-06d6-4b17-97e7-91173d300295.filesusr.com/ugd/6864df_267de89cf374478bb8f462d681940f31.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0e30658a-1f33-4e01-8cdb-4605d0dc41af/63790898539.pdf
    • https://dd67658a-cc17-4e1c-bca5-42bf299a485b.filesusr.com/ugd/07a440_4b56e200929a4687aec42df6829e2fc4.pdf?index=true
    • 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_off0000e2ea.bin
d7c192f1c07127869200e9ac4f149cffc2b6a27a0e4e1d9a2e3b0cfb8b94343a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EA 6056 bytes
font_01_sfnt_off0000f7a4.bin
f9318e2d0a21ffa413a326bbb465a66d023fbcddb60780b165f9412f074b3b4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A4 9888 bytes

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