Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c964bbc263d0b3a…

MALICIOUS

PDF

72.9 KB Created: 2021-01-10 16:40:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: fefbaa72efed6a775d2401f7c786491e SHA-1: 95258f753a3d89e9bbfdde3a71458af3aad75cc2 SHA-256: 3c964bbc263d0b3a325770ed620bdce065f9ff1a9c1adefd18b80ef4504a0369
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous external URIs pointing to disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure strongly indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://trafficel.ru/123?utm_term=kruskal+wallis+test+example PDF link annotation
    • https://jerexibim.weebly.com/uploads/1/3/4/6/134654770/dekiruraxizapi.pdfIn PDF document text
    • https://site-1083678.mozfiles.com/files/1083678/35759462209.pdfIn PDF document text
    • https://cdn.sqhk.co/gepeduvo/chdiflv/forest_wallpaper_for_pc.pdfIn PDF document text
    • https://site-1173209.mozfiles.com/files/1173209/performance_appraisal_comments_for_supervisors.pdfIn PDF document text
    • https://site-1178749.mozfiles.com/files/1178749/muworozuxig.pdfIn PDF document text
    • https://site-1177224.mozfiles.com/files/1177224/93541406465.pdfIn PDF document text
    • https://site-1177663.mozfiles.com/files/1177663/lenovo_ideapad_3_14.pdfIn PDF document text
    • https://pojozuwowate.weebly.com/uploads/1/3/4/6/134631913/gujebujotoni-vixivupelazo-setesara.pdfIn PDF document text
    • https://geregilewupune.weebly.com/uploads/1/3/4/8/134849809/9452920.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413125/normal_5fc7f01594b37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484363/normal_5fbd1787ebd23.pdfIn PDF document text
    • https://kugixixubeleji.weebly.com/uploads/1/3/4/3/134324677/feaade84efef6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFB 5156 bytes
SHA-256: 40477e912f9f28dc6eab6a31972b3d438fb7d3a7581f84f238a69fdf673df562
font_01_sfnt_off0000f186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF186 11124 bytes
SHA-256: 3da85428a57ed5f07c2e17f463467cc8c89f0f6e86a91e35392f7f6e96727acd

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