Malicious PDF — malware analysis report

Static analysis result for SHA-256 05c87580fb15aaed…

MALICIOUS

PDF

75.6 KB Created: 2020-12-25 14:08:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4f8ca6a572d3e5ed3c31c4d12479a73 SHA-1: 358c1e48b006f3bf11981fb507edd0c764d9ccb6 SHA-256: 05c87580fb15aaed1a6877b5d4d7a4c93727193bd3fb71c8cf928346b3304960
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an embedded URI pointing to 'trafffi.ru', which is likely a malicious domain used for phishing or malware distribution. The document body is heavily obfuscated, but the presence of the external URI and the high confidence verdict suggest an attempt to redirect the user to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/123?utm_term=otis+spunkmeyer+cookies+oven
    • https://cdn-cms.f-static.net/uploads/4492875/normal_5fc0a4f11f74b.pdf
    • https://cdn-cms.f-static.net/uploads/4366321/normal_5f87d51f51d9c.pdf
    • https://cdn.sqhk.co/junizafuzep/R35G7YO/72137081486.pdf
    • https://cdn.sqhk.co/vutexexukus/ihihgg6/66594382414.pdf
    • https://cdn-cms.f-static.net/uploads/4401545/normal_5fd27a7bc6274.pdf
    • https://cdn-cms.f-static.net/uploads/4380883/normal_5fad9f202d931.pdf
    • https://cdn-cms.f-static.net/uploads/4419452/normal_5fb54d5566249.pdf
    • https://cdn-cms.f-static.net/uploads/4403422/normal_5f97b809dc898.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/resisuna/calligraphy_handwriting_practice_sheets.pdf
    • https://s3.amazonaws.com/mijedusovineti/42742310752.pdf
    • https://s3.amazonaws.com/zonebon/75630611799.pdf
    • https://s3.amazonaws.com/xanunafojuloki/online_c_editor_gdb.pdf
    • https://s3.amazonaws.com/sebunuzu/nilagonid.pdf
    • https://s3.amazonaws.com/luxelula/910501492.pdf
    • https://s3.amazonaws.com/dedinavesute/20756877987.pdf
    • https://s3.amazonaws.com/liguwubore/brainwashed_book_ben_shapiro.pdf
    • https://s3.amazonaws.com/nonipesikiri/38864035081.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_off0000ea92.bin
9293a13298ab41ff020169b739f0561ce87286eb54e7ec9548b3b37ff4e0e9ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA92 5092 bytes
font_01_sfnt_off0000fbe2.bin
e16517b6950526128db2dad1dc28f7065d8f98a9e82eb4d0dd5cf1e1935bf393		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE2 10436 bytes

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