Malicious PDF — malware analysis report

Static analysis result for SHA-256 b39ca707e557a1bf…

MALICIOUS

PDF

79.4 KB Created: 2021-03-17 20:33:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00ad9ae626ad77aa3a1d3984cc67e877 SHA-1: e0cdd42976844f7264b49b277d1b9c9f3250b3e5 SHA-256: b39ca707e557a1bf6804d5fe1296021738d13a70ddbd2e1dfe4f447c0eb64af5
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, with a specific ClamAV detection name indicating it's a phishing trojan. An external URI heuristic points to a suspicious URL, 'https://golowaki.ru/award?keyword=arap+bahar%25C4%25B1+tunus+pdf', which is likely used to deliver a secondary payload or phish for credentials. No scripts were extracted, but the PDF structure and external URI suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://golowaki.ru/award?keyword=arap+bahar%25C4%25B1+tunus+pdf
    • https://static.s123-cdn-static.com/uploads/4446507/normal_5ff3f50643fc2.pdf
    • https://cdn-cms.f-static.net/uploads/4493578/normal_602fe9e9af84d.pdf
    • https://static.s123-cdn-static.com/uploads/4465539/normal_5fee89f969ec6.pdf
    • https://static.s123-cdn-static.com/uploads/4371023/normal_5ff7587572d43.pdf
    • https://cdn-cms.f-static.net/uploads/4424935/normal_5fd1290dcee9b.pdf
    • https://cdn-cms.f-static.net/uploads/4415534/normal_601f70768fa20.pdf
    • https://static.s123-cdn-static.com/uploads/4413373/normal_5ffbaea55088f.pdf
    • https://cdn-cms.f-static.net/uploads/4446507/normal_60222631a7629.pdf
    • http://funomixukipiv.iblogger.org/87131167009.pdf
    • https://cdn-cms.f-static.net/uploads/4467005/normal_5fd63c78a886f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://teraropabu.epizy.com/gelumisomilasisexoxevo.pdf
    • http://zexikewilupime.rf.gd/xozifovoxixo.pdf
    • http://kizarup.epizy.com/the_fox_and_the_crow_moral_of_the_story.pdf
    • http://fovawipemezipu.myartsonline.com/nowizojamaju.pdf
    • http://najekaweza.onlinewebshop.net/barron_s_gre_3500_word_list.pdf
    • https://4541bc1c-e35c-4de3-bb44-1f53c3e1a56d.filesusr.com/ugd/68f66e_d99648e7f44949dead2a235ff5eb9ae8.pdf?index=true
    • https://b00f38ea-0d13-4519-ab0f-1253f0d03ca0.filesusr.com/ugd/289c5e_30b1c15b162f42c8a175719dcc0b9d58.pdf?index=true
    • http://xajizufobuvofo.epizy.com/excel_spreadsheet_shortcuts.pdf
    • http://parimafilifupev.rf.gd/imagenomic_portraiture_keygen.pdf
    • https://c78ffd2e-fc3d-4272-86ca-968d835fb7ad.filesusr.com/ugd/0f9ef0_81354cb18a6e479d85f44f0b2c44036e.pdf?index=true
    • http://nufagogofuj.epizy.com/toxiwifetaxowonol.pdf
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_56cde434c58c4ccfa563e6152285c062.pdf?index=true
    • http://bedegotix.epizy.com/21487476475.pdf
    • https://a91873a8-1f5b-4151-915d-af39eb211f25.filesusr.com/ugd/3f80ec_d72466ddd1874b73a7154cbeaf855d11.pdf?index=true
    • 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_off0000f7d6.bin
0ef11b6515e89abf868552172c73ef68ad2f4ab32299236cb676b05f3edf87ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D6 5256 bytes
font_01_sfnt_off000109aa.bin
46ac9f6a06e48db1bcac84befe4f2ac540ac8595f399791409b215c7a3b3ce99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109AA 11788 bytes

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