Malicious PDF — malware analysis report

Static analysis result for SHA-256 d66d749d6b8d588f…

MALICIOUS

PDF

72.1 KB Created: 2021-02-21 15:30:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b50b227eef7108eba05781a67a71048f SHA-1: 3f584eedb8c68b21b326f477ec0cf984b306d851 SHA-256: d66d749d6b8d588f49f1ad7c417ce5ac27cfc38053a6233655dc8d7496e2c852
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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+much+does+paper+shredding+service+cost PDF link annotation
    • https://cdn.sqhk.co/vakusukereju/bhjjdA2/87701071138.pdfIn PDF document text
    • http://milukiwidawedej.22web.org/easy_electric_guitar_songs_for_beginners_tabs.pdfIn PDF document text
    • https://tiruzezisuwef.weebly.com/uploads/1/3/4/4/134499189/lifunud.pdfIn PDF document text
    • https://cdn.sqhk.co/lakisitu/jhDIXgf/mudding_spa_nyc.pdfIn PDF document text
    • http://svoytrylend.xyz/rolirugevilzu.pdfIn PDF document text
    • https://cdn.sqhk.co/geroterunetu/feftLhe/bevosodifadakex.pdfIn PDF document text
    • https://nekamefirojes.weebly.com/uploads/1/3/0/7/130739169/b22bf93.pdfIn PDF document text
    • http://wacc-cat.org/ireland_vs_new_zealand_match_report7gunk.pdfIn PDF document text
    • http://ejqy.com/93858406306ezzms.pdfIn PDF document text
    • https://budamasut.weebly.com/uploads/1/3/4/9/134903336/3460380.pdfIn PDF document text
    • http://service-hire.com/97904216743dfo4m.pdfIn PDF document text
    • http://udilische.club/vermintide_2_executioner_sword_guide9he7z.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vaguwiraji.rf.gd/imperative_form_german_trinken.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/daily_attendance_register_format_in_excel.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_off0000dcea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEA 5568 bytes
SHA-256: 0ad4936811e9e53de89e9a19b728025c5b96cbb789dedf032adda60277957db6
font_01_sfnt_off0000efc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC5 10504 bytes
SHA-256: c988cba58992c789aeee353013971b577de478e695c07bcdd46e09e9523378c1

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