Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9da5f0a3082f293…

MALICIOUS

PDF

72.5 KB Created: 2021-02-23 03:25:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 607e1e47fe53374fd42f39181046687e SHA-1: cb2c189d33520fd24babf3b8072be248d8c83548 SHA-256: a9da5f0a3082f2938e2148e403adf41838124451117d14db065d58e309eb1f42
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains and potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ClamAV detection and ML classifier also strongly suggest malicious intent, likely phishing or a link farm designed to redirect users to harmful sites. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://seumenha.ru/strik?utm_term=books+for+teenage+anxiety PDF link annotation
    • https://cdn.sqhk.co/mijajijem/iWKpYxf/nokobolovimipitejuj.pdfIn PDF document text
    • https://votujejigep.weebly.com/uploads/1/3/1/3/131380583/9546819.pdfIn PDF document text
    • http://sewonmedix.ru/80992172173tsxjg.pdfIn PDF document text
    • https://cdn.sqhk.co/dojopaxitovi/jPXhiyT/mokuwoxojifesopavepovo.pdfIn PDF document text
    • https://cdn.sqhk.co/bisegepamitu/wgjkijB/12428221169.pdfIn PDF document text
    • http://yognat.space/google_test_c_tutorialyzecj.pdfIn PDF document text
    • http://magnifioco.site/pebodobomixoux3fg.pdfIn PDF document text
    • https://cdn.sqhk.co/mamevugixej/jgHgghb/stick_warriors_super_battle_war_fight_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/miwiwefe/CKgcmPJ/red_ball_gown_dresses_ebay.pdfIn PDF document text
    • http://coolstudent.space/lg_wade_organic_chemistry_9th_editionkwbsv.pdfIn PDF document text
    • https://zopodiwozexuma.weebly.com/uploads/1/3/4/7/134737972/salaro.pdfIn PDF document text
    • http://casser.xyz/96713131058owvm4.pdfIn PDF document text
    • https://vokarojunez.weebly.com/uploads/1/3/2/6/132696330/322e3f329c29.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/alevines_guppy_deformes.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/15185523428.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD3 5188 bytes
SHA-256: 2c6c4a61f31dbf44b43bba7a101c1ad6e2e804ec4343ffbb6fce966411fa8b1d
font_01_sfnt_off0000f19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19E 10468 bytes
SHA-256: 5d69dde2962e72a202e0b71344631829a211ae1df9d3e6430bda8799d506a8d1

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