Malicious PDF — malware analysis report

Static analysis result for SHA-256 a41295fe344d4e33…

MALICIOUS

PDF

98.6 KB Created: 2021-02-15 13:18:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 49c6a91f00ba91c5d65d6876fe1d6a1e SHA-1: 13776ab10895c8d37836195bffa5e1315b60cfaf SHA-256: a41295fe344d4e33c6d96be94d7d7a20014a1859099b0062667e2448bc91c98d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier strongly indicate this is a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attack pattern designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://maypoin.ru/strik?utm_term=in+small+things+forgotten+chapter+7+summary PDF link annotation
    • https://cdn.sqhk.co/fonixoligem/8hgifgf/how_to_hack_among_us.pdfIn PDF document text
    • https://cdn.sqhk.co/xeposetuge/mFIugdv/jirirupadekizul.pdfIn PDF document text
    • https://nizevamil.weebly.com/uploads/1/3/2/8/132814567/0c96f.pdfIn PDF document text
    • https://cdn.sqhk.co/kisesawaropo/IFgjz6q/sasujagedasag.pdfIn PDF document text
    • https://cdn.sqhk.co/pifonode/bgMgeS0/helix_jump_app_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372721/normal_5fd8d9e166233.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420930/normal_60224ed215949.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446394/normal_601ba5995b893.pdfIn PDF document text
    • https://cdn.sqhk.co/rezalabobo/ghyidib/tron_lightcycle_power_run_layout.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369771/normal_60095fd7096cc.pdfIn PDF document text
    • https://fobuxowomi.weebly.com/uploads/1/3/4/2/134235628/619b02013f1535.pdfIn PDF document text
    • https://cdn.sqhk.co/dolafita/hVo717k/39941125133.pdfIn PDF document text
    • https://cdn.sqhk.co/xonoguduzob/AvYcbhc/99022638720.pdfIn PDF document text
    • https://cdn.sqhk.co/jidobimatu/geMzLqa/tijikitogesivamewovozekoj.pdfIn PDF document text
    • https://cdn.sqhk.co/rogumabutur/ekTGfjj/download_extreme_car_simulator_2018_mod_apk.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/timeziso/network_topology_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/agile_project_management_methodologies.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_off00014550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14550 5548 bytes
SHA-256: bbe000dec2a9741160c63c8336469f98794a57d35519066aac96c2be84ce7644
font_01_sfnt_off00015813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15813 10804 bytes
SHA-256: c48d901a6cfd518850be80066f7b15618982c9828459208c86cae5e8218f054b

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