Malicious PDF — malware analysis report

Static analysis result for SHA-256 78cbf62a7ac6c794…

MALICIOUS

PDF

83.1 KB Created: 2021-05-24 17:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 020f3c2914283f029ada2db5ce27c3c8 SHA-1: 501a897b3a514860db968791105c12888f0d1163 SHA-256: 78cbf62a7ac6c794354f5418d6da18623a3aee6ff452337ba18d5277ceb551a7
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many pointing to other PDF files, suggesting a link farm or SEO manipulation tactic. One of the primary external links is to 'seumenha.ru', which is suspicious. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/strik?utm_term=how+to+diagnose+schizoid+personality+disorder PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4500889/normal_5ff622cabf41f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455883/normal_6048e5689aef4.pdfIn PDF document text
    • https://fesuxuxij.weebly.com/uploads/1/3/4/6/134693362/63a13e3b9cd982.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446152/normal_606a830a78b62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479673/normal_6048f2ba1d2b0.pdfIn PDF document text
    • https://lurufabufukigo.weebly.com/uploads/1/3/1/4/131407807/3caa4e2ce304.pdfIn PDF document text
    • https://vekupaju.weebly.com/uploads/1/3/4/4/134479754/gatege.pdfIn PDF document text
    • https://xivogere.weebly.com/uploads/1/3/0/9/130969247/0c6030ab.pdfIn PDF document text
    • https://wasinipexo.weebly.com/uploads/1/3/4/3/134362371/kaviwanafute.pdfIn PDF document text
    • https://rabifitirigi.weebly.com/uploads/1/3/0/7/130739094/d1c15.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/mamukawaxatali/equifax_credit_report_application.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/how_to_use_layers_photoshop_elements.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/26762397935.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/best_paid_apps_android_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/medieval_2_total_war_stainless_steel_sub_mods.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/cg_video_song_free_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/12137638966.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/chotta_chotta_hd_video_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/how_to_rig_a_pole_for_catfish.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/area_of_triangles_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/gimisorixosu/badumur.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/tekin_rsx_pro_specs.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_off00010914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10914 5540 bytes
SHA-256: 5bc91060d7bcc7b5d5051409d8c0cbc9aa851325ec592102037c2e6cad46ea3b
font_01_sfnt_off00011c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C09 10156 bytes
SHA-256: b2f31e83e2da2a6aad3ba1fb5ecdaf8afdc30e32fa62596e0cf6a8680f1b75f3

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