Malicious PDF — malware analysis report

Static analysis result for SHA-256 dda7992943dc223d…

MALICIOUS

PDF

65.4 KB Created: 2021-01-17 11:56:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 0ff01d4070a382d08491e2a6c241f9cd SHA-1: e7148e2b50413f05133fde7c33dced88eb525c3e SHA-256: dda7992943dc223d7da440983f6fac762f11ebf5bd6d09919790bf23e08a679a
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'trafffi.ru', which is likely a phishing or malware distribution site. The document body, though heavily obfuscated, appears to reference 'Nanda nursing book pdf', suggesting a lure to attract victims interested in nursing resources.

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://trafffi.ru/123?utm_term=nanda+nursing+book+pdf PDF link annotation
    • https://cdn.sqhk.co/nolugavetiri/6gjigXH/40160035183.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392444/normal_5fad329a3faf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368977/normal_5f983f62b2ebb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478923/normal_5fa8aabf956c0.pdfIn PDF document text
    • https://site-1168374.mozfiles.com/files/1168374/94876045036.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475716/normal_5ff2098f6cb6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414491/normal_5fd3191c6593a.pdfIn PDF document text
    • https://site-1171720.mozfiles.com/files/1171720/black_friday_black_friday_walmart.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465249/normal_5fd9df06785c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366407/normal_5f87fd9342880.pdfIn PDF document text
    • https://site-1175399.mozfiles.com/files/1175399/free_funny_sayings_ringtones.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490746/normal_5fb56e8c8e085.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366633/normal_5f88a4699620a.pdfIn PDF document text
    • https://cdn.sqhk.co/pafevola/vbjbjd6/assistant_director_job_description_early_childhood.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/piradi/baltimore_ravens_injury_report_week_14.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/forever_21_shoes_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/gawokepe.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/62104417176.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/alejandro_jodorowsky_yo_el_tarot.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_off0000c282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC282 5348 bytes
SHA-256: c9720c0b88c600d9ec47d2a079a1820b9c9ae40da95609a74ebeb4647dda5975
font_01_sfnt_off0000d4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C3 10592 bytes
SHA-256: 629c560a0cb6b5976376e1d711208f7dfb4095dd55bc168353e9111eeac83aff

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