Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9c5bcaae30156fb…

MALICIOUS

PDF

72.9 KB Created: 2021-01-15 08:45:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f31565c662f486ea476361732c7d9930 SHA-1: 7fa17ac3ede9f6409e8e38a60f557af8fbe868cf SHA-256: d9c5bcaae30156fb987bfc901426471f12052f54377d01e26c60a48e6d40665f
116 Risk Score

Malware Insights

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

The file is a PDF document flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing or trojan. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, a common tactic in tech-support scams and callback phishing. While no scripts were directly extracted, the presence of embedded URLs suggests a potential for further malicious activity, such as directing the user to a phishing site or initiating a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://trafffe.ru/123?utm_term=navy+hurt+feelings+report PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408002/normal_5f944aff6a83d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478415/normal_5fa91063d63d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370072/normal_5fc94ab3e4e96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366366/normal_5f8f954854905.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485162/normal_5fd75dfa76d86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484359/normal_5fa74ef2706f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451567/normal_5fe3b95358755.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454547/normal_5fa537645707c.pdfIn PDF document text
    • https://cdn.sqhk.co/lawafopugu/ljhiihd/cute_animals_to_draw_easy.pdfIn PDF document text
    • https://zupelewelasilag.weebly.com/uploads/1/3/4/5/134594614/zowenubonot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375344/normal_5fa935dae19a2.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/bupaxomu/black_mamba_transformers_ls-_03.pdfIn PDF document text
    • https://s3.amazonaws.com/kevava/60796650515.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/jimakekojinejotesebabot.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_off0000de45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE45 5296 bytes
SHA-256: ab2d2cb4c0974d124c04b89d705304576e5d23e89272f883464a2486584bafe9
font_01_sfnt_off0000f05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05C 11368 bytes
SHA-256: 8f55d4ad242083979b7e1d91cbddc8d2573b1f0acf8a7a7fdf8f0c42791c06a9

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