Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cd8b9d373389368…

MALICIOUS

PDF

158.4 KB Created: 2021-03-22 09:02:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: daa09e06dcf66b97ca03e08669cb1867 SHA-1: ba5f175815f6ce417b1526bddbbf855a0080b12b SHA-256: 9cd8b9d37338936899cfcd72c27b4399e7a58af39562dc9d0da820c58c4816f8
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, 'golowaki.ru', which is likely used to host a malicious payload or phishing page. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, potentially masking the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/award?keyword=antecedentes+de+la+independencia+de+mexico+pdf
    • https://subafoxa.weebly.com/uploads/1/3/1/3/131379179/8073757.pdf
    • https://static.s123-cdn-static.com/uploads/4391624/normal_5febc1788afa5.pdf
    • https://mazanotofubemiz.weebly.com/uploads/1/3/2/6/132681192/povotu.pdf
    • http://gta-msk.ru/xetosakaxukakakowumiye8ld.pdf
    • https://cdn-cms.f-static.net/uploads/4369776/normal_6021a6cba9d38.pdf
    • http://lidzadva.xyz/8484338557ohlp7.pdf
    • http://vostokzapad.su/reading_exercises_for_pre_intermediate_studentstrpas.pdf
    • https://lanulizuxuja.weebly.com/uploads/1/3/4/6/134658029/5483911.pdf
    • https://static.s123-cdn-static.com/uploads/4375361/normal_5fc91878dee70.pdf
    • https://cdn-cms.f-static.net/uploads/4476148/normal_600db181ba355.pdf
    • https://cdn-cms.f-static.net/uploads/4486060/normal_60396d535aae8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/de72689a-de43-4855-942f-542762c3a514/practice_4-3_triangle_congruence_by_asa_and_aas.pdf
    • https://uploads.strikinglycdn.com/files/817d7e1d-e5b4-4638-8f80-506d71a1ae84/88637240237.pdf
    • https://uploads.strikinglycdn.com/files/b80c4e83-83d3-45c1-92d6-1a26db90bb0a/rheem_rbhc-17_specs.pdf
    • https://uploads.strikinglycdn.com/files/013a0d29-af26-4ac2-9ce3-872ccebe8516/7061676548.pdf
    • https://uploads.strikinglycdn.com/files/ecd60cf5-72b3-4400-9c6b-d9f6cfbe72cb/16899934312.pdf
    • https://uploads.strikinglycdn.com/files/2f8f1abe-d67c-4a78-acdc-e93718ede8d4/how_to_feed_and_care_for_your_husband.pdf
    • https://uploads.strikinglycdn.com/files/19c6e14c-6803-4ef2-b16f-9b739385d18d/26548893068.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000222e8.bin
3d2931c3f4c0428b3c01fa6b2662231563ffb3d833d06846c64c49b51933835e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x222E8 5048 bytes
font_01_sfnt_off00023402.bin
fcb157d8205e3310bbe5ef2870e3d7a6bda9a64afb7ef2152fc697be41d72b69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x23402 13072 bytes
font_02_sfnt_off00025dd4.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x25DD4 4324 bytes

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