Malicious PDF — malware analysis report

Static analysis result for SHA-256 a33d64a08458dd62…

MALICIOUS

PDF

67.3 KB Created: 2021-03-21 20:52:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a52f428f346d69bf157de324f0122f6 SHA-1: 729b668e0caec23d3d2c7201ff820ddecc379579 SHA-256: a33d64a08458dd628c306593ca1049e445d435dec04509ea656fd311c87803c6
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 high likelihood of malicious intent. It contains an embedded URI pointing to a suspicious domain, suggesting it's used for phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to 'alphabet letter tracing pdf', which is likely a pretext to disguise the malicious nature of the file.

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://vilenefex.ru/award?keyword=alphabet+letter+tracing+pdf
    • http://dimax-matrasy.ru/9829366657nauyc.pdf
    • https://limazosit.weebly.com/uploads/1/3/1/3/131380555/579ac19bb9919.pdf
    • http://natiral.space/machine_learning_project_proposal_templatetuih7.pdf
    • http://sedemolijiv.22web.org/android_app_to_convert_webpage_to.pdf
    • https://puxorubawi.weebly.com/uploads/1/3/5/3/135349856/sezutuvamuveregotode.pdf
    • https://cdn-cms.f-static.net/uploads/4498702/normal_605357f47cd1b.pdf
    • https://gofabede.weebly.com/uploads/1/3/1/4/131453232/ruminaritani-sawex.pdf
    • https://cdn-cms.f-static.net/uploads/4481667/normal_6016944667f0b.pdf
    • http://vodoroding.info/9140552985qs3kr.pdf
    • https://falopizesolirod.weebly.com/uploads/1/3/1/3/131379111/lajil.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kukazowox/20607241934.pdf
    • http://sawotopedexorod.epizy.com/86079599114.pdf
    • https://uploads.strikinglycdn.com/files/529b9952-d964-4401-aa8f-8afbd51394b6/29318877680.pdf
    • https://uploads.strikinglycdn.com/files/ef4fcb8a-811d-4dee-b81d-790f33476865/the_bridge_to_total_freedom.pdf
    • https://uploads.strikinglycdn.com/files/90112b02-7163-4017-ab27-d44672ef6570/kedadomagez.pdf
    • https://uploads.strikinglycdn.com/files/5c1d2964-d8e3-4f7d-9da3-86fa645f1367/kipukepada.pdf
    • http://dusefepov.epizy.com/ramemazavibibogupe.pdf
    • http://mulurezo.epizy.com/blockchain_o_reilly.pdf
    • https://s3.amazonaws.com/megodipewukitoj/stemi_guidelines_2017_web_addenda.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_off0000cbb4.bin
e4e104d7509b3ee19a55a228116582a4f0c779cdeab53e4810091d58cc8412c8
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB4 5368 bytes
font_01_sfnt_off0000dde9.bin
4a0ddcf077b8fa5da38a2b7a94334a577cf9d451d30a5aee010be63e3cfefd4c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE9 9996 bytes