Malicious PDF — malware analysis report

Static analysis result for SHA-256 295409540cc3fbb9…

MALICIOUS

PDF

79.3 KB Created: 2021-02-22 10:56:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 272882091dd6801e7e5ee9777bd57cf4 SHA-1: 9e0fbbbb2b348d246d2ef16a27a54a927de9ed61 SHA-256: 295409540cc3fbb93f8a01a3f580b4fdcd0c8ff8345fa826b4361cbcd63eab4c
126 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links pointing to various domains, many of which are associated with disposable hosting and link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily corrupted, contains fragments that suggest a lure related to historical text, possibly to mask the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=complaints+of+the+third+estate+french+revolution
    • http://psylath.com/vugedowgz7kh.pdf
    • https://static.s123-cdn-static.com/uploads/4457311/normal_60062179cca4f.pdf
    • http://jopkapopka.online/lana_del_rey_ultraviolence_zipiewkj.pdf
    • https://cdn-cms.f-static.net/uploads/4467007/normal_601f155b785d8.pdf
    • https://cdn-cms.f-static.net/uploads/4405185/normal_6024652550030.pdf
    • http://italdom.fun/81494503057roh3l.pdf
    • http://poradoit1.site/what_test_strips_does_true_metrix_air_usefjoml.pdf
    • http://byseles.xyz/los_chiriguanos_formosa_argentinae94s6.pdf
    • http://qwertyujg.xyz/zojiri0anw2.pdf
    • https://static.s123-cdn-static.com/uploads/4420434/normal_60004411685f7.pdf
    • https://static.s123-cdn-static.com/uploads/4379379/normal_5fe3ab93470de.pdf
    • http://okrasote.info/lezodumefojexotapefumibophu6nr.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vikukinumet/formal_cocktail_attire_definition.pdf
    • https://s3.amazonaws.com/fovezewi/fimawetorefepitinexoka.pdf
    • https://s3.amazonaws.com/bulolimepol/us_army_survival_battleground_mod_apk.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8da.bin
e8f65c56627035d60d14f3b4f7d28defa1a60b289a8452997d7acc44889b2c19
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DA 5360 bytes
font_01_sfnt_off00010aee.bin
2fc744d09077f583da93ed62ff9af31b148dc88a59211433e593bf43e9bd0a16
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEE 10928 bytes