Malicious PDF — malware analysis report

Static analysis result for SHA-256 b142f8ce9fdd225b…

MALICIOUS

PDF

79.6 KB Created: 2021-02-24 14:11:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: cb583301edfd678acbe60b4522545cd7 SHA-1: d7d40385d0678df81ade2efa44d052d68b9d5534 SHA-256: b142f8ce9fdd225bb49a573664a28c254062dd18bd51262e55be7eb20db63ed1
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, including one to 'maypoin.ru/award', suggesting a phishing or content-luring attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are characteristic of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/award?keyword=how+many+days+a+week+to+workout+for+best+results PDF link annotation
    • https://cdn.sqhk.co/goduwonon/cwtXJge/94924170936.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/jjfWkAw/76307819855.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388067/normal_60110b1eb96dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471230/normal_5fed3dbc2a506.pdfIn PDF document text
    • https://nawexolaka.weebly.com/uploads/1/3/4/7/134704757/5628529.pdfIn PDF document text
    • https://cdn.sqhk.co/nobixapo/cpUjhb7/depisabape.pdfIn PDF document text
    • https://cdn.sqhk.co/lupobikud/jjh3wIP/stickman_backflip_killer_4_hack.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/vazisi/nolivajitejobimoramonebaf.pdfIn PDF document text
    • https://s3.amazonaws.com/taguxif/resefabakilosunazamewiza.pdfIn PDF document text
    • https://s3.amazonaws.com/memexelu/conference_poster_presentation_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/canon_eos_utility_2._6_mac.pdfIn PDF document text
    • http://wixudilasajigil.rf.gd/c_d_stress_feline_feeding_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/latufenaw/bluedio_hurricane_turbine_instruction_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/40942132614.pdfIn PDF document text
    • http://dawozisi.rf.gd/the_veldt_theme_of_family.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_off0000fb84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB84 5412 bytes
SHA-256: c5f50cab5b566d00718e7774d431ea185e825e2af62004e96a5205ec64a1a814
font_01_sfnt_off00010dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEA 10336 bytes
SHA-256: cbdbf86e14783e59df68569c6c033c8b394383cc9ce94ea5cd3f5f70a179fa5c

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