Malicious PDF — malware analysis report

Static analysis result for SHA-256 45109a5fe00d4598…

MALICIOUS

PDF

73.4 KB Created: 2021-02-18 19:48:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0506c31741e17173e9849abdf845bf5a SHA-1: df171a9ab45b4f834544b82956430744ef5ee2d1 SHA-256: 45109a5fe00d4598b72565f08d1c5f369f7fd30561006c54a1c63a2158339df6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on various domains, suggesting a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this as a phishing or malicious PDF. The presence of embedded URLs and the nature of the links indicate an attempt to redirect users to potentially harmful content.

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 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://bologen.ru/strik?utm_term=how+to+plot+all+the+columns+of+a+dataframe+in+python PDF link annotation
    • https://cdn.sqhk.co/tovisegag/f7Ggjgj/galinanekogovite.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376619/normal_60099f424d7f6.pdfIn PDF document text
    • https://cdn.sqhk.co/dubutemaruxu/DMjcoid/taretutejafosifexid.pdfIn PDF document text
    • https://cdn.sqhk.co/fifapupifig/hggezje/61223357858.pdfIn PDF document text
    • https://cdn.sqhk.co/budafitanu/ie1hiX8/6831125094.pdfIn PDF document text
    • https://cdn.sqhk.co/bopelara/dgcjjCz/zofevuvagolememapovaw.pdfIn PDF document text
    • https://mozokidadivu.weebly.com/uploads/1/3/1/1/131164210/573a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500429/normal_600ddf14550ad.pdfIn PDF document text
    • https://cdn.sqhk.co/vakanaju/D9eXhfC/mining_inc_game_advanced_manipulators.pdfIn PDF document text
    • https://cdn.sqhk.co/fujalapevame/Viaexia/melodyne_5_student_discount.pdfIn PDF document text
    • https://cdn.sqhk.co/jaguwubax/jXzhchh/40891423315.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475204/normal_6007e3e241469.pdfIn PDF document text
    • https://cdn.sqhk.co/wezikinupig/ljahaNl/expression_idle_away.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_off0000df2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2E 5552 bytes
SHA-256: baa6c36621dd8a50275ddbf3534ec09372cfcb8a618507a98882df488d5c9143
font_01_sfnt_off0000f1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F9 11552 bytes
SHA-256: 1c1b1ca1e2c9a792bd30dc66e6b172e33459fb9df389621992ccf3a8106bf26c

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