Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3191cf3f0416907…

MALICIOUS

PDF

74.5 KB Created: 2021-02-04 14:51:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a07f0f43fb477797841367ca8c71fdb1 SHA-1: 6d583a0942883f102576bcc0a55641ddadbc7984 SHA-256: b3191cf3f04169071681f5740bc790bd27288a1c351db6abe2c911ce6c4f11c8
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, and is flagged by ClamAV as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, suggests a lure related to 'benefit segmentation definition pdf'. The presence of embedded URLs and the overall structure strongly indicate a phishing or scam attempt designed 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/wb?keyword=benefit%20segmentation%20definition%20pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366004/normal_5fff384c73770.pdfIn PDF document text
    • http://helplnstagramoffice.com/ben_10_coloring_pictures_freemkob6.pdfIn PDF document text
    • https://notalajamuneno.weebly.com/uploads/1/3/1/3/131378915/fusopolepemukala.pdfIn PDF document text
    • http://marinarus.space/running_man_hd_eng_subdefwm.pdfIn PDF document text
    • https://cdn.sqhk.co/kopilixa/hisgdTw/2019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385415/normal_6005c9dfb6a46.pdfIn PDF document text
    • http://maska-respirator.com/bunavefop7szq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485704/normal_5fee90331c90a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367313/normal_60078e5423571.pdfIn PDF document text
    • http://good-production11.site/10463428975wpimz.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/zowejunef/twin_sheets_walmart_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/titugome/72794425920.pdfIn PDF document text
    • http://zubikexef.rf.gd/66984573192.pdfIn PDF document text
    • http://zogirifo.epizy.com/printable_math_worksheets_grade_5-_6.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_off0000e542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE542 5280 bytes
SHA-256: 57d47c3d65e5806fe758df8d47ffa56e912a0dd9bfc551dcd188e7f10098f878
font_01_sfnt_off0000f732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF732 11584 bytes
SHA-256: 9d94ecff6501fe6329a1533c6e3703ae49fa340e48216ac650dbd7681563767f

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