Malicious PDF — malware analysis report

Static analysis result for SHA-256 285e05bedb361680…

MALICIOUS

PDF

86.0 KB Created: 2021-04-08 15:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 654f167d130f32e13dc1c975713d270f SHA-1: 16d67cbaf1126ed99a48e94c8cfd76fdd0360d0e SHA-256: 285e05bedb361680ef72030404d68274ffea38ca36415f7dd3941ac68460edcb
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. Although no scripts were extracted, the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/strik?utm_term=word+pdf+formatting+issues
    • https://cdn-cms.f-static.net/uploads/4421205/normal_600d61f8868ad.pdf
    • https://cdn.sqhk.co/ruxagoxoman/PFyig1S/79578670074.pdf
    • https://cdn.sqhk.co/kexofebiziv/ihjahjO/mater_education_high_school_adventure.pdf
    • http://wagijap.22web.org/bavupatixagimibuzu.pdf
    • https://cdn.sqhk.co/degavorofala/ZShbzoX/wijubijagemufunidemasefu.pdf
    • https://cdn-cms.f-static.net/uploads/4490125/normal_60460debefb5b.pdf
    • http://rotixumuzu.22web.org/how_many_questions_are_on_the_cdl_air_brake_test_in_florida.pdf
    • https://cdn-cms.f-static.net/uploads/4419192/normal_60551ff69e3e7.pdf
    • https://cdn-cms.f-static.net/uploads/4369781/normal_6017f721719b6.pdf
    • https://static.s123-cdn-static.com/uploads/4424646/normal_6003965bb42c5.pdf
    • https://static.s123-cdn-static.com/uploads/4368504/normal_5fdf96fa360fd.pdf
    • https://cdn-cms.f-static.net/uploads/4501057/normal_606c81d11d624.pdf
    • https://cdn-cms.f-static.net/uploads/4387243/normal_605586d5f152f.pdf
    • https://cdn-cms.f-static.net/uploads/4491965/normal_5fdbd8608a197.pdf
    • https://cdn-cms.f-static.net/uploads/4446280/normal_600a1ed518ad5.pdf
    • https://cdn.sqhk.co/sawomunuj/hdiejgE/free_mini_games_ps4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://puzekubaxi.epizy.com/effects_of_bullying.pdf
    • https://17851959-1482-4b49-8222-7b7b0c628459.filesusr.com/ugd/3cb679_fae5f0894e9e489fa54962b032806c3a.pdf?index=true
    • https://def05634-b969-4265-beeb-1e7d695e9a44.filesusr.com/ugd/6865ce_d0384855ae53480192477ac15841ec2c.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fba.bin
8c9ccb6071221f6ad3dcac871eaad8aa5074ffd74120efe69c5bac235dea28b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBA 5344 bytes
font_01_sfnt_off000121dd.bin
ac069c407267773d4914c10baa02169a8c4e387e11bd3e18b2ae9b442bf711a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121DD 12036 bytes

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