Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd85c64a6282917a…

MALICIOUS

PDF

68.7 KB Created: 2020-12-25 11:50:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b629312b6f13dd8d1be98445dcd0355 SHA-1: 1abcdf8ce058d15bffc3f4f68961c288418ebe3b SHA-256: fd85c64a6282917ad5b9654268dd7c3fae1f33e2b04a42e536cdd1811cb316e4
96 Risk Score

Malware Insights

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

The file is identified as malicious by a ClamAV detection and an ML classifier. It contains an embedded URI pointing to 'traffine.ru', which is likely a phishing or malware distribution site. The document body, though heavily obfuscated, suggests a lure related to chemistry problems, indicating a targeted phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/123?utm_term=limiting+and+excess+reactants+problems
    • https://static.s123-cdn-static.com/uploads/4383567/normal_5fc56881372a6.pdf
    • https://static.s123-cdn-static.com/uploads/4380078/normal_5fc54ab5c5115.pdf
    • https://cdn.sqhk.co/nivuduful/LEqpgdq/77416711211.pdf
    • https://cdn-cms.f-static.net/uploads/4389582/normal_5fa7e4bec11a7.pdf
    • https://cdn-cms.f-static.net/uploads/4389604/normal_5fa08d7c5916f.pdf
    • https://cdn-cms.f-static.net/uploads/4366343/normal_5f92133358301.pdf
    • https://cdn-cms.f-static.net/uploads/4367944/normal_5fd91ae3f3b61.pdf
    • https://delazodudiz.weebly.com/uploads/1/3/4/5/134591817/fd4dc721f445.pdf
    • https://cdn.sqhk.co/vizinifum/hfNlWhc/mini_golf_paradise.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fidefofudi/81609782311.pdf
    • https://uploads.strikinglycdn.com/files/c79103c6-01f7-4f66-8cfc-99ccaefb367c/95649741742.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_off0000ce4c.bin
826c00b0e2134897be7eec9010bd75607b4c18270e47f1942e723cb16a6a19eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4C 5540 bytes
font_01_sfnt_off0000e10a.bin
d4555891aaa1412a2de6e3fe9d1bebcf1ae202845a722742693817e37f9d8a8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE10A 11020 bytes

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