Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ac4cc9ea8cd2c26…

MALICIOUS

PDF

77.4 KB Created: 2021-03-17 08:31:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec3130abaacf843806c1af6f80026242 SHA-1: 712a7df8763941262fcae9e3ec52182fcc1b45de SHA-256: 2ac4cc9ea8cd2c26e770ed691e9af6427c9cf72aaa071df17a2012d5b8824545
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'vilenefex.ru', which is likely part of the phishing or malware distribution mechanism. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, further supporting the idea of a web-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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/strik?utm_term=calendario+escolar+2018+y+2019+sep+jalisco
    • https://static.s123-cdn-static.com/uploads/4370299/normal_5ff2bc65d0866.pdf
    • https://cdn.sqhk.co/romilononove/iaCgc23/bloodsport_gif_drums_jump_around.pdf
    • http://wotidoteked.mywebcommunity.org/pemava.pdf
    • http://janafan.scienceontheweb.net/83571478249.pdf
    • https://cdn.sqhk.co/lopijikuvi/gpidClf/11290955998.pdf
    • http://wajazenizur.mywebcommunity.org/guitar_bar_chords_chart.pdf
    • http://pofaduxiruk.getenjoyment.net/what_is_the_set_aside_prayer.pdf
    • https://cdn.sqhk.co/xawobovuji/jjijhfY/classroom_management_styles_authoritative.pdf
    • http://vowujebotoza.mywebcommunity.org/kepulowoxurupib.pdf
    • https://nonexivibofopuv.weebly.com/uploads/1/3/4/6/134603010/986473.pdf
    • https://wojanoxunoliwam.weebly.com/uploads/1/3/5/3/135394081/vivesufuzel.pdf
    • http://dujojiwasemob.mywebcommunity.org/information_security_and_data_protection_policy_template.pdf
    • https://cdn.sqhk.co/vavusiwi/Cruihhh/lavoxibew.pdf
    • https://sabidodavo.weebly.com/uploads/1/3/1/4/131408103/xovanivopezi.pdf
    • https://rosatavur.weebly.com/uploads/1/3/2/6/132695818/givixetudef-jipozafuvo-dugesek.pdf
    • https://cdn-cms.f-static.net/uploads/4373753/normal_604d6f31e74a4.pdf
    • http://bapatavusirave.mygamesonline.org/mozaradijid.pdf
    • https://cdn.sqhk.co/rifarako/pibichc/gazuxevarad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1a60e689-93f1-4954-97a4-449bbc18a8b6/dyson_cordless_vacuum_repair_manual.pdf
    • http://dotopaku.atwebpages.com/purorisuxepefutaruvi.pdf
    • http://mifedisiso.atwebpages.com/68447386943.pdf
    • https://uploads.strikinglycdn.com/files/05dc92f8-64bf-4235-be65-4519d0efc40e/what_does_it_mean_when_a_gecko_licks_you.pdf
    • https://uploads.strikinglycdn.com/files/898931aa-3476-467f-ae9e-508d2f8565c6/20662432707.pdf
    • https://uploads.strikinglycdn.com/files/de6c5427-3e64-4512-8a7d-8278c99ee276/ms_excel_2007_formulas_with_examples_in_hindi.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_off0000ede4.bin
e347ba498277aa78eddee3cabaf0a42b358d8ddcf1eb1b84980f4d1153525525		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE4 5824 bytes
font_01_sfnt_off000101cc.bin
a49701a170b8a33366da47f733b34fec5cbd75d01703a728949c25adef85854b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101CC 11964 bytes

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