Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a268bd25afeca99…

MALICIOUS

PDF

81.4 KB Created: 2021-02-18 07:14:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c21b05626bdc2f94d9e83d1013e57ecc SHA-1: e6c625f57e57c49d9f1d94eae91ae38755b3c15b SHA-256: 8a268bd25afeca99ea5e7110553cc6199c6553e753432102de4cfd703b0d3181
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to manipulate search engine results. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=anatomy+and+physiology+case+studies+pdf
    • https://cdn.sqhk.co/vejuwozigef/c9jfLic/2pac_changes_lyrics_download_mp3.pdf
    • https://sitegevom.weebly.com/uploads/1/3/4/6/134664280/meruvujimalokes.pdf
    • https://toraboretopupu.weebly.com/uploads/1/3/4/7/134769369/redoxakejir.pdf
    • http://limons.space/kirineloguseliluxegurofhqrdr.pdf
    • http://morj.space/vevor_30l_distiller_manualz8gx6.pdf
    • https://cdn.sqhk.co/nuroteditu/p6haDu0/joxuwobufa.pdf
    • https://pujeradix.weebly.com/uploads/1/3/2/6/132695809/difosun.pdf
    • https://cdn.sqhk.co/zajagatetode/GieVqid/dopofekimupagatota.pdf
    • http://best-ital.fun/50505373785f0j09.pdf
    • https://bepupoxusiboma.weebly.com/uploads/1/3/4/8/134847186/fozixigatoxobotu.pdf
    • http://zerkalo-fugicar.website/knowledge_based_interview_questions_and_answers7v470.pdf
    • https://cdn.sqhk.co/pavetikedur/1hfibhg/25114130280.pdf
    • https://molowusutet.weebly.com/uploads/1/3/1/3/131380828/dupemomeb.pdf
    • https://zumikifekov.weebly.com/uploads/1/3/0/8/130813997/b8ee2.pdf
    • https://dufofisejufosu.weebly.com/uploads/1/3/4/8/134875198/zisufuzasu.pdf
    • https://cdn.sqhk.co/bazexolareja/5vwhjNx/idle_car_factory.pdf
    • https://wezenazuzive.weebly.com/uploads/1/3/4/7/134764498/zuxunariwutez.pdf
    • https://tepogixe.weebly.com/uploads/1/3/1/4/131437844/6926279.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/pirofopafu/takipekagojaniradoxixu.pdf
    • https://s3.amazonaws.com/dixaleko/42559920661.pdf
    • https://s3.amazonaws.com/nilafafakem/beyond_compare_4_pro_crack.pdf
    • https://s3.amazonaws.com/nawosineromigi/contractions_worksheets_for_1st_graders.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f335.bin
5f500565f63226a68ac35084dc9499f6cc55a980b9d83d6fb89d8af71074152c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF335 5448 bytes
font_01_sfnt_off0001059d.bin
b9b2cd18a3334f76b62a828a8c3ab034907be8ad44e1a56c7df22c072b63b760		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1059D 10456 bytes
font_02_sfnt_off00012948.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12948 4324 bytes

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