Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a6e4f2bd9ac42e5…

MALICIOUS

PDF

71.9 KB Created: 2021-02-24 06:58:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5343945e71676cc856c62d1b4e58cd32 SHA-1: 514463f518aa7d82c132587f9e4ce822b944dede SHA-256: 5a6e4f2bd9ac42e537584538d236df30e9491bf625e494760e2c443b6f653ccd
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 external URI pointing to a suspicious domain, likely intended to redirect the user to a malicious site. The document body is heavily obfuscated, but the presence of embedded URLs and the overall detection suggest a phishing or malware distribution attempt.

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://leonvi.ru/wix?keyword=major+triad+worksheet
    • https://static.s123-cdn-static.com/uploads/4485321/normal_5fee1213a82ab.pdf
    • http://tezubimisigej.iblogger.org/appreciation_certificate_format_word.pdf
    • https://cdn-cms.f-static.net/uploads/4449424/normal_6029c6c576c27.pdf
    • https://cdn-cms.f-static.net/uploads/4446921/normal_5fe6e30d04866.pdf
    • https://static.s123-cdn-static.com/uploads/4379841/normal_5fcce1bcbf0b8.pdf
    • https://static.s123-cdn-static.com/uploads/4464319/normal_5ff1336248357.pdf
    • https://cdn.sqhk.co/dexujagafir/e8lkdja/budget_pc_build_parts_list.pdf
    • https://static.s123-cdn-static.com/uploads/4368949/normal_5fc978d535ffe.pdf
    • https://cdn-cms.f-static.net/uploads/4422637/normal_6011ebbe67ff5.pdf
    • https://cdn.sqhk.co/zujubokave/bggFhhr/52338194900.pdf
    • https://cdn-cms.f-static.net/uploads/4369653/normal_6035a147487e8.pdf
    • https://cdn.sqhk.co/jugomuzuteb/Jgdidif/susalabuvon.pdf
    • https://cdn-cms.f-static.net/uploads/4385217/normal_5fd679a63a880.pdf
    • https://cdn.sqhk.co/dixejetafap/Hvctghb/52613428413.pdf
    • https://cdn-cms.f-static.net/uploads/4415537/normal_600a23014388c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zikepodaw.epizy.com/blue_background_png_free.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_off0000ddf3.bin
da7ae73948209fa38e9606ccca02f5877c0c927c06b01540f84c83a8f7bbea74		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF3 5120 bytes
font_01_sfnt_off0000ef77.bin
652f157b265365b5f57f06a419a5e859d65446945a3d2e820d1ef8c9682d2c89		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF77 10276 bytes

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