Malicious PDF — malware analysis report

Static analysis result for SHA-256 e15d5c3ca7f6e02d…

MALICIOUS

PDF

69.3 KB Created: 2021-02-14 02:49:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 9a6c7064a6f449badd1161e8838bcc21 SHA-1: 71fcfd8489d15bf264a6bb1f5d862b0256e77058 SHA-256: e15d5c3ca7f6e02dde2058bdc7269e06d2a7c68a924def7267a7c1239c491174
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, strongly suggesting a phishing or malware distribution attempt. ClamAV and ML classifiers also flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/wix?keyword=glencoe+world+history+modern+times+chapter+12+assessment+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383322/normal_600dc53d0a74e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496824/normal_5fe0fcbbc70e9.pdfIn PDF document text
    • https://cdn.sqhk.co/xekixuzurim/8V1shdN/fidovububaxetovazavenugu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366398/normal_6016784b4fc77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375088/normal_60278e563f6cd.pdfIn PDF document text
    • http://edarudost.online/caste_validity_certificatep84n3.pdfIn PDF document text
    • http://bigswinner.space/ravens_vs_steelers_game_timen0qmn.pdfIn PDF document text
    • https://cdn.sqhk.co/tamoravuwera/fOghXid/dallas_stars_travel_hockey_league_schedule.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497110/normal_602403eba10f2.pdfIn PDF document text
    • http://online-sistem.site/76511225760l151g.pdfIn PDF document text
    • http://mexicotop3.xyz/ferrite_loop_antennaow26y.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/wumodukubaru/vogediburevesaladanawi.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/gesazobafivevo.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/murefakuxavaket.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_off0000c8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C1 5720 bytes
SHA-256: 21ab451b8343813409598cc4866b9c2eaad300be4640e499b1062f118b22bd49
font_01_sfnt_off0000dc27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC27 13688 bytes
SHA-256: 21d5a4e124c540778b11ae923c67407a559e3b50744548297a15021df8b16860

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