Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b20db246230b59…

MALICIOUS

PDF

71.6 KB Created: 2021-02-19 00:48:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 41f3e1a96d39140745e1c0685b858e75 SHA-1: 72a8339fb19d1a16373fae2d01fcda83434a47fd SHA-256: 88b20db246230b59046d3788dfdfe83d1e5b9b89b9810062375f01bad99d44c1
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a ClamAV signature and an ML classifier. It contains an embedded URI pointing to a suspicious domain, 'seumenha.ru'. While no scripts were explicitly extracted, the presence of an external URI in a malicious PDF strongly suggests an attempt to redirect the user to a phishing or malware distribution site, aligning with spearphishing tactics.

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://seumenha.ru/123?utm_term=how+to+use+negative+z+score+table PDF link annotation
    • https://cdn.sqhk.co/gukokefa/eMW3ig8/xoxapewipa.pdfIn PDF document text
    • https://cdn.sqhk.co/remezebona/jCiJgjh/26114044450.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447271/normal_5fddff34158d9.pdfIn PDF document text
    • https://cdn.sqhk.co/jisujesox/hcOgijg/airthings_wave_plus_smart_radon.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/hbCxhcL/28253887544.pdfIn PDF document text
    • https://wusowekop.weebly.com/uploads/1/3/2/7/132741020/4628130.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/free_android_app_source_code_android_studio.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/24724686301.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/free_benefit_fundraiser_flyer_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/bipadinajopapaduk.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/73619220158.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA18 5272 bytes
SHA-256: 45e66af62a4a6525c2775c3179a8b00b0a805ce0ea322ed4a8647711b325b13e
font_01_sfnt_off0000ec37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC37 11048 bytes
SHA-256: ec99508cdfbb9b1622c4d1509e4a8f4779c3a0b5cee5ceda8ca60ba12d325b26

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