Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a5ba8405f7a895…

MALICIOUS

PDF

87.8 KB Created: 2021-04-09 01:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e03c33830d6709ca54426bacb4eff49 SHA-1: 77de373b8bb05b07dbe07195b13c1bc2e3019019 SHA-256: 09a5ba8405f7a895d4387af663a1ce2cabf028d4384b780e364f4bb9f8366f57
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links pointing to various domains, many of which appear to be disposable or used for SEO manipulation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of numerous external links suggests an attempt to redirect users to potentially harmful content or to game search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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/strik?utm_term=the+consolations+of+philosophy+alain+de+botton+audiobook
    • http://icily.xyz/bon_jovi_greatest_hits_album_free7s74v.pdf
    • http://pristav.pro/ge_cafe_36_gas_cooktop_cgp95362ms18whu4.pdf
    • https://jixawapideraje.weebly.com/uploads/1/3/3/9/133997308/xalosijosanufi-buzijelalubobe-verafowavap.pdf
    • http://itabody.space/weather_report_for_berlin_ohioi5ekw.pdf
    • https://tazivori.weebly.com/uploads/1/3/1/4/131438523/3224848.pdf
    • http://qwert-ita.fun/atmosfearfx_creepy_clowns4edid.pdf
    • https://varovugunigode.weebly.com/uploads/1/3/4/4/134480676/8676428.pdf
    • http://goldstein.capital/lagewovocqcl0.pdf
    • http://ighelperscenter.com/sevorelatinavedutugeti9ei7.pdf
    • http://lenudes.com/monster_truck_wallpaper_download7houx.pdf
    • https://pusobufuronuwu.weebly.com/uploads/1/3/4/4/134475569/votejiguworexim_raxivegegap_mupiwipinu.pdf
    • https://dakusarifupufa.weebly.com/uploads/1/3/3/9/133997242/8934971.pdf
    • http://potoborotagivud.22web.org/ludutegezano.pdf
    • http://gotiwekiz.iblogger.org/how_to_calibrate_bosch_glm_15.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lalepimesizi.epizy.com/pc_jain_paleontology_download.pdf
    • https://3dbd840c-7861-42b4-b064-af52d1d2f4eb.filesusr.com/ugd/86319b_aadb1b68b02a4b0685bc1991fbcc5000.pdf?index=true
    • https://2a6c20f5-091f-48b5-a5be-bf749919b1f6.filesusr.com/ugd/3794ad_2430963ecbf142d596b25be190446e36.pdf?index=true
    • http://murarefap.epizy.com/a_level_mathematics_notes.pdf
    • http://xikisefux.epizy.com/81364394905.pdf
    • http://sejigesenevemi.epizy.com/maytag_neptune_washer_troubleshooting_nd_code.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_off0001119f.bin
4aa65973f0838e1f72350156c3c650aa9b1bf0962f249097de01bc00a14666ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1119F 5400 bytes
font_01_sfnt_off00012408.bin
cf8feccc4c1af8b46cb4a5d7535ef612e9219903c5615634e7d199e6c7075cee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12408 13692 bytes

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