Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d8210664d41e4f6…

MALICIOUS

PDF

75.1 KB Created: 2020-12-16 22:43:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 99b1c9d13704ea69d8817b04177ce066 SHA-1: 7f0074878efe0bf68a4402adcd2443449c40dd39 SHA-256: 9d8210664d41e4f6fb97f16985beac75003a54f1d3deab5c64fa1ab8976b7b5b
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The embedded URL 'https://traffking.ru/123?utm_term=about+the+author+examples+for+students' is identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence, and ClamAV detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffking.ru/123?utm_term=about+the+author+examples+for+students In PDF document text
    • https://cdn-cms.f-static.net/uploads/4445116/normal_5fb861eda0ac6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377095/normal_5faf5cd3da42d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475208/normal_5fb38704180b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407749/normal_5fd9f325b312c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389365/normal_5f9adabd38446.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481173/normal_5fc30787e274f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/277333f6-3fc9-4ab1-adf0-257f4d7d9e0d/war_for_the_planet_of_the_apes_full_movie_subtitles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4720235-b3a4-4325-9756-8e8ddbc9c9e6/rsca_navy_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c70209f-6148-48a5-8cad-61b4f0892873/psx_emulator_premium_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/bronchial_asthma_bts_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccef9835-cd6c-4bf0-bfcd-567b4491c25e/weber_beer_can_chicken_pan.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_off0000e6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E3 5476 bytes
SHA-256: d97a066a2771fc738149e82e2306df964ab163214785eeff69636a418163eebf
font_01_sfnt_off0000f959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF959 11324 bytes
SHA-256: c4c2034b33bc1e26028f6393570de8380959664f0eca1c3a634e9e4a7862f22c