Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b218f0533708519…

MALICIOUS

PDF

78.0 KB Created: 2021-05-25 13:40:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d764c4b72a4c5f6d9683cfc891b88d7 SHA-1: aee9b2a837f3b33bd25ac9c3d2f1324cbd18c52b SHA-256: 3b218f053370851972844453a0dec57bf509cdb43cee977055b44987b99f16b1
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms and phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URL and the link farm heuristic suggest the primary goal is to redirect users to malicious websites.

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-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://seumenha.ru/strik?utm_term=personal+pronouns+worksheet+1st+grade
    • https://gatevipamor.weebly.com/uploads/1/3/4/8/134878843/gizapudikumaxixov.pdf
    • https://cdn-cms.f-static.net/uploads/4486534/normal_604cd9ca11dd6.pdf
    • https://cdn-cms.f-static.net/uploads/4454042/normal_60513651df799.pdf
    • https://static.s123-cdn-static.com/uploads/4370078/normal_60020f67a5b68.pdf
    • https://static.s123-cdn-static.com/uploads/4471464/normal_5fff6e4fd7178.pdf
    • https://static.s123-cdn-static.com/uploads/4454048/normal_5ff910ce5694c.pdf
    • https://cdn-cms.f-static.net/uploads/4489853/normal_603fb61e133d1.pdf
    • https://tivofexogi.weebly.com/uploads/1/3/1/3/131398075/9554222.pdf
    • https://vogoniboka.weebly.com/uploads/1/3/1/0/131070279/pipurerolebapawe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ff540c3c-aabc-4d28-a8ab-4a03a7df87b2/89732677745.pdf
    • https://uploads.strikinglycdn.com/files/938fe10e-853f-4b1f-878f-3010d96972e0/what_are_the_3_parts_of_the_security_structure.pdf
    • https://uploads.strikinglycdn.com/files/2854ebee-4bab-4e65-9da7-b9d900e8a067/nobody_writes_to_the_colonel_summary.pdf
    • https://uploads.strikinglycdn.com/files/82f93e8b-17b8-4aae-bf16-0a44ff5e2ef0/bepajikagegudawawivenuret.pdf
    • https://uploads.strikinglycdn.com/files/3295f0aa-6399-4b2d-8ce8-7489fb505237/coleman_425e_camp_stove_fuel.pdf
    • https://uploads.strikinglycdn.com/files/1c94a958-07bc-4e62-b0c9-326697a0569c/roleg.pdf
    • https://uploads.strikinglycdn.com/files/ff6cf528-84db-46bf-883c-1028b122b301/how_to_update_factorytalk_view_studio.pdf
    • https://uploads.strikinglycdn.com/files/23b7ce2d-5516-445e-a02e-c02ddf9cae52/18039219732.pdf
    • https://uploads.strikinglycdn.com/files/2c6f1e7b-5854-429f-8d22-4a3a0594d63c/43246225903.pdf
    • https://uploads.strikinglycdn.com/files/229c0ed2-fd58-4a55-942c-cf854887e413/zijatofebonokexe.pdf
    • https://uploads.strikinglycdn.com/files/acd7d488-3725-4420-9575-e6fb91565aec/lixutuwiv.pdf
    • https://uploads.strikinglycdn.com/files/9ab4e94c-9fc7-4878-84f6-09a028a71ee3/what_is_iso_9001_version_2008_standard.pdf
    • https://uploads.strikinglycdn.com/files/642e437b-3dc0-4d58-a3af-7d1de55a32c4/14471758714.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_off0000f330.bin
2b0c15574e809c0ee59d3951f7eb911490a3840e37a7d057d8416a12cb5a228f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF330 5428 bytes
font_01_sfnt_off000105ba.bin
16f27e7b8fbba8f144f0058a83a2545017e81bb05f414a9733bc8a501ff2646e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105BA 10832 bytes

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