Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef13188de39572d3…

MALICIOUS

PDF

132.1 KB Created: 2021-01-12 17:22:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 604ffc9b9a12d6b75d9810f26db43d84 SHA-1: 4bd2fd0bb9d2359f35e30ef607024ae86a27ba42 SHA-256: ef13188de39572d3d85aa76fc9ba66125819bf429ced108633b38e6c60e06665
96 Risk Score

Malware Insights

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

The file is a PDF document flagged by ClamAV and an ML classifier as malicious, specifically as a phishing trojan. It contains an embedded URL that points to a suspicious domain, likely serving as a lure for users. The document body, though heavily obfuscated, suggests a context related to 'guidelines', reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://trafficel.ru/aws?utm_term=unprovoked+dvt+chest+guidelines PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4411709/normal_5fe6bea2c8937.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488806/normal_5fd8bea17a24b.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwufupi/BN6vjgR/late_90s_pop_music_playlist.pdfIn PDF document text
    • https://cdn.sqhk.co/xasexuwosul/jhjhiiF/los_picapiedras_costumes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375350/normal_5fb8e3a99c6e0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476947/normal_5ff4fa9b757db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369786/normal_5fb5208e7dc36.pdfIn PDF document text
    • https://cdn.sqhk.co/bufutoje/hjoTVgf/98646625620.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387036/normal_5f8f831c7dd05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371004/normal_5fb41b837ffbc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407994/normal_5ff9ffa464502.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417534/normal_5fd7cd92b2735.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388162/normal_5f9161a9d4a39.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382948/normal_5fe2b9bb66389.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001bdbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BDBB 5120 bytes
SHA-256: a4b67ef11c09bfec2223a1837f62dfb42c8c7494af30ffd4c28df9d4867b7cab
font_01_sfnt_off0001cf27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF27 11500 bytes
SHA-256: 0d542ff8abee6ee579c79d47a52212dc5a7f817f2370c223b76f4f6a9f549c69
font_02_sfnt_off0001f48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F48C 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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