Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a2cb062e2de62b8…

MALICIOUS

PDF

72.2 KB Created: 2020-11-18 01:41:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 58bb78e73d662cc0ffb6892d0285140f SHA-1: 134266e46dfb03aca243ca108ffd0285a17553b0 SHA-256: 3a2cb062e2de62b83ea14c9df892924cc65523109647eeba816ab01e9eb0e069
104 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a phishing lure. The embedded URL `https://trafffe.ru/aws?utm_term=bookkeeping+and+accounting+books+pdf` suggests the document is designed to trick users into clicking a link related to bookkeeping, likely leading to a malicious site. No scripts were extracted, but the PDF structure and heuristics point towards a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/aws?utm_term=bookkeeping+and+accounting+books+pdf
    • https://juboxunogaruf.weebly.com/uploads/1/3/4/7/134700559/8944033.pdf
    • https://cdn-cms.f-static.net/uploads/4389801/normal_5f9d8495f0953.pdf
    • https://cdn-cms.f-static.net/uploads/4378848/normal_5f8fa780a76b9.pdf
    • https://cdn-cms.f-static.net/uploads/4409093/normal_5f99f7b25882d.pdf
    • https://cdn-cms.f-static.net/uploads/4484358/normal_5faaff5603860.pdf
    • https://bitujidup.weebly.com/uploads/1/3/4/5/134598072/9213617.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kikunojulejuj/bapepufe.pdf
    • https://s3.amazonaws.com/jiwisi/supreme_court_citations.pdf
    • https://s3.amazonaws.com/vibove/sopudexas.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_off0000db05.bin
4a7958b5456b9b518d15cf06a8b81a8aba61940bff705a58fe681fd005392111		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB05 5448 bytes
font_01_sfnt_off0000edab.bin
b831ddb8f384b86e89f7fd615a49523e781e70642a6852bd1a7d90561e7fcded		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAB 11232 bytes

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