Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cde9152a9b8a6bf…

MALICIOUS

PDF

75.1 KB Created: 2021-01-01 17:41:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b2c1e6e85d110a24a5b1d7d703560f0 SHA-1: d5a6491d69a533ad89f9f45c5a66ddd974c90b90 SHA-256: 9cde9152a9b8a6bf319b7cae8a5092db435ed376f551d946a341826ecac727e2
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a significant number of embedded links, with several pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body appears to be obfuscated or corrupted, but the presence of a link related to 'technical project manager jobs' suggests a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gettraff.ru/strik?utm_term=technical+project+manager+jobs+in+denver+co
    • https://cdn.sqhk.co/mawejoxejobe/dcmgfgf/artillery_fire_control_system.pdf
    • https://cdn.sqhk.co/koxopumo/gjGGgh1/nisaginofefuniwogudi.pdf
    • https://taneromujek.weebly.com/uploads/1/3/4/6/134611199/5355266.pdf
    • https://cdn-cms.f-static.net/uploads/4366381/normal_5f8817cebf255.pdf
    • https://cdn.sqhk.co/bumadawab/xDgcRjg/93933985664.pdf
    • https://cdn-cms.f-static.net/uploads/4417032/normal_5fd3bcddbbf1a.pdf
    • https://zidabowejixu.weebly.com/uploads/1/3/1/1/131163559/bemetoxa.pdf
    • https://static.s123-cdn-static.com/uploads/4447263/normal_5fc67fe1080ad.pdf
    • https://cdn-cms.f-static.net/uploads/4379363/normal_5f8f71ad2d532.pdf
    • https://cdn-cms.f-static.net/uploads/4379385/normal_5f94a4e93fb0b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xanofamaja/5298105679.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e85c.bin
5b0527b6ab16eadf5f54f4508844bea8ab918dd1a36e71fe99d7f24186449c6b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE85C 5712 bytes
font_01_sfnt_off0000fba2.bin
9e3fd159691dc4ebdf8a52ffd9bfec6c93ac50249dba64d933002f243a3c5953
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA2 10488 bytes