Malicious PDF — malware analysis report

Static analysis result for SHA-256 7681ab3f04506459…

MALICIOUS

PDF

65.5 KB Created: 2020-12-22 15:48:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 3bf16ba66feeeaa67a3dbce9935af700 SHA-1: 162f8bd8227b48cd3f59925d803afeaa6e0b065f SHA-256: 7681ab3f04506459ec16992f2c971609e1e5b679d07e7ef6998d302cd4ed5d30
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/strik?utm_term=freeway+closures+55'. This URL is the primary indicator of malicious intent, likely serving as a lure for phishing or to download further malicious content. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

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://cctraff.ru/strik?utm_term=freeway+closures+55 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375541/normal_5f8b8f47cbc15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382189/normal_5fb76cad075b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370304/normal_5f88316c9b1d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404488/normal_5fc65590e3c98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403565/normal_5f918dbf8ac5f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404727/normal_5fdf4c58cb147.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499329/normal_5fdfa8cd550c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469640/normal_5fc09ad4cdb15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366343/normal_5fd61d77e1ee0.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/bd17ef5d-4ecb-4abe-98dd-76681fcb7136/busatuwimotivabekumepelu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6907c5b-991f-4ae2-bc7c-73ee03eb12a8/31804033035.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/latolire.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_off0000c45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC45F 5068 bytes
SHA-256: 5dc29e1a48570b9a0e5c2ddd9c01f49f8692eaa199873651522717b59058ef66
font_01_sfnt_off0000d5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C7 10500 bytes
SHA-256: fe41062ed2b9e8285160d38919d92a69052b32974422809583a8348edbd1c96e