Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1a393d759c16592…

MALICIOUS

PDF

73.3 KB Created: 2021-05-19 06:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a426f59cc94795939f88dfb59b124b3e SHA-1: 72e7fa74e5bab42a8fac1cfd01bc4431f8bd8e9d SHA-256: e1a393d759c165921c5cbf6fc134db57f20954b6f8d91aaf494c2c3724aa6328
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve a secondary payload. No scripts were extracted, but the presence of the external URI is a high-priority indicator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/strik?utm_term=aggression+scale+test+pdf
    • https://static.s123-cdn-static.com/uploads/4382789/normal_5fca8fc8f0b11.pdf
    • https://cdn-cms.f-static.net/uploads/4459630/normal_60676581f000b.pdf
    • https://cdn-cms.f-static.net/uploads/4375357/normal_606ad9cfaecb4.pdf
    • https://cdn-cms.f-static.net/uploads/4418399/normal_601dd81e8491e.pdf
    • https://cdn-cms.f-static.net/uploads/4467612/normal_5fe7608366f1b.pdf
    • https://cdn-cms.f-static.net/uploads/4393761/normal_6033747c48e41.pdf
    • https://static.s123-cdn-static.com/uploads/4366032/normal_5fcc3a76ab6d1.pdf
    • https://static.s123-cdn-static.com/uploads/4379221/normal_5ff824c63ed5d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/murudute/58914706338.pdf
    • https://uploads.strikinglycdn.com/files/27d9c416-f05e-4797-b3be-affa7738dca2/huskee_riding_lawn_mower_engines_for_sale.pdf
    • https://s3.amazonaws.com/zisulamisozoto/79718778065.pdf
    • https://uploads.strikinglycdn.com/files/4de029c5-1ef1-48aa-8404-c036cba0844b/53706088335.pdf
    • https://s3.amazonaws.com/rejiner/zasabexazil.pdf
    • https://uploads.strikinglycdn.com/files/3bafaf29-0c5f-4066-a392-24a6627ffd5f/75178414317.pdf
    • https://uploads.strikinglycdn.com/files/abb25bbf-4c37-4ded-a31a-c1eaf879a5e9/gejekirujiwuk.pdf
    • https://uploads.strikinglycdn.com/files/08a6de47-ebdb-430a-bb90-f4cfb4959ca9/singapore_math_live_primary_6.pdf
    • https://uploads.strikinglycdn.com/files/5bd96837-4411-4db7-b720-71e25bed9005/office_365_learning_free.pdf
    • https://s3.amazonaws.com/jidagafinuxesu/airlift_performance_banner.pdf
    • https://uploads.strikinglycdn.com/files/181d2f84-1653-43f2-bb03-9bd5df98f4ad/59575508045.pdf
    • https://s3.amazonaws.com/nazekisigiduz/wezikosonujowemaso.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca40.bin
f529c4a738835643135b1953e04afd2ffe4bf96580b437dd8eb5c3118a5f949b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA40 5312 bytes
font_01_sfnt_off0000dc68.bin
5df06c4b194a37dfb7025ce06a80760a03c3c657b095f492b91a56e166d4a223		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC68 10864 bytes
font_02_sfnt_off00010171.bin
fb27248ec02d804caa0ce6a8dd06a8f0f211157336bc50f6c382585ff5fe3da3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10171 16084 bytes

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