Malicious PDF — malware analysis report

Static analysis result for SHA-256 b973613c3e3a0460…

MALICIOUS

PDF

69.9 KB Created: 2020-12-28 11:55:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c4fe2f7cf46bfe2b186dac09a8306314 SHA-1: 0fca3d0f69325431099463fce86a5b7a9e11e4e9 SHA-256: b973613c3e3a046092796e7c4f51449f34cdddeeea3b90d3c0ed644d91cea049
154 Risk Score

Malware Insights

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

The PDF file contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged this PDF with a high probability of being malicious. The embedded content, though heavily obfuscated, suggests an attempt to disguise the malicious link as a 'Nudie fit guide', indicating a phishing or social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://ggtraff.ru/123?utm_term=nudie+fit+guide In PDF document text
    • https://static.s123-cdn-static.com/uploads/4466675/normal_5fc3c756be565.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365601/normal_5fce9777e0d5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413590/normal_5fc1aa32aeb69.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369772/normal_5fe2ac573007e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480403/normal_5fb72ce2a6c79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498883/normal_5fad75ebbb05a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467322/normal_5fde1ab889ffa.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/waxegatulo/vitoxamivezidomibo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d05bde6-c924-4e0e-a7d3-2587f6f1ce66/41111469413.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38cf3b2f-0435-4456-afe1-7127f6dfc4b2/budugolakajuxis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efb00106-2a19-4542-9130-807d4aa9da0e/ethyl_acetate_polarity_vs_water.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_off0000d9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F5 4528 bytes
SHA-256: 12b67890d3319f03e52499e4172b80eaf27319af9e97376dbd4fdcc71c6b5d89
font_01_sfnt_off0000e97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97E 10088 bytes
SHA-256: 7a89f49ec2b0d6ca159978de58c9b42bba4db638764ebc46873a60a0fd58133a