Malicious PDF — malware analysis report

Static analysis result for SHA-256 13be2181a725b27a…

MALICIOUS

PDF

115.4 KB Created: 2020-12-16 07:17:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1d19ebf56bef952211c0d0bac8f1be6d SHA-1: c0f20d01d6907d4279b9fb967d5ed61b7fa3e496 SHA-256: 13be2181a725b27aee24acc33421d2c5a65d296949d8c36f1c76ebf1614cbc2e
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified by ClamAV as a phishing trojan. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, suggests a lure related to a technical manual, likely to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=mechanical+vibrations+solutions+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375890/normal_5fbba7e4cbca9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381762/normal_5f9dbc539e961.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401723/normal_5f94deca6139c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487625/normal_5fcaf5c59c183.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/wotodedaruzuk/unimac_washer_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/13002677673.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/nintendo_3ds_emulator_free_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/bangla_english_arabic_calendar_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/fupavuxedaduwoligu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3c655d26ff1194f85c811/t/5fcd32811e1a4d7de13555c7/1607283330763/new_houseparty_logo.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/pursuit_of_hat_2_17.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/osrs_runescape_smithing_guide.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4e9a3485235c86bcda6c/1606373018518/62357245882.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_off00018682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18682 5244 bytes
SHA-256: 9ee7f2c891eb09cc78a9a094b4df5f20e53fc3520ba214e1f4337ba0ed345726
font_01_sfnt_off0001983c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1983C 12036 bytes
SHA-256: d9cb40911846d5b84345327176e0efecaf377a0496a420fdfc398dae4807d709