Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f03e029e3a2f83c…

MALICIOUS

PDF

74.5 KB Created: 2021-03-17 06:43:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 53464dce0ca0f2bfe101c7bf8b7590c0 SHA-1: 5d6f272d95814eb5644da311017059544ea53d56 SHA-256: 5f03e029e3a2f83c5a12016ef4e92796894893175bde52900a91884158998ec4
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, as malicious. It contains numerous embedded URLs pointing to disposable domains, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farm characteristics indicates an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/strik?utm_term=green+tree+python+snake+for+sale+uk
    • http://cashtanks.fun/animated_video_songs_for_kids_free0v6xq.pdf
    • http://mabay.fun/the_lion_the_witch_and_the_wardrobe_summary_chapter_8ub8u9.pdf
    • http://milansit.space/how_does_a_retractable_screen_storm_door_work1mf9j.pdf
    • http://vk-settings-change.online/65559501268gd7dp.pdf
    • https://cdn.sqhk.co/xijisejes/PAjeicj/bilge_pump_switch_manual.pdf
    • http://azorocheat1.xyz/48945483492xlpxh.pdf
    • http://lolkek.xyz/pld_high_school_cheerl1jrm.pdf
    • https://cdn-cms.f-static.net/uploads/4425515/normal_6027b2c173739.pdf
    • http://maska-respirator.com/citoneurin_bula_injetavelby9fj.pdf
    • https://cdn.sqhk.co/wapadofiwe/jj0yLhj/64517475984.pdf
    • http://sarkife.site/wujajolufotiwaf971k7.pdf
    • http://vostokzapad.su/935650167070dxlo.pdf
    • http://salonhq.xyz/19392852263tsdk5.pdf
    • https://cdn.sqhk.co/sejejajoxej/hbjijeo/solar_system_for_kids.pdf
    • http://3-bureaureport.info/d-link_dir-615_change_admin_passwordyw1gs.pdf
    • https://cdn-cms.f-static.net/uploads/4470533/normal_603d99c5d4417.pdf
    • http://parrrtner.xyz/maslow_toward_a_psychology_of_being_summaryf5hdy.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d52aed46-be45-4f9b-8106-cf6fc7ee66c0.filesusr.com/ugd/b148e5_e94daf4d2b6043f29845eb6e876aad24.pdf?index=true
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_c17b4a13228f4c5d93a208d614540be5.pdf?index=true
    • https://91506351-5699-48ce-85e7-8e7d071f4e87.filesusr.com/ugd/d775a9_0caf7284942b47a58f2caf7757a1c403.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_off0000e40b.bin
faaabec1976b0980c08bfc92ea00bde82546a8f924833dca3f9616c7c7ce4c35		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE40B 5184 bytes
font_01_sfnt_off0000f5b5.bin
2ae3f238b57e07c6d97a1cac2b7db1f3336391f958abef161dc1cce30ef95585		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B5 11484 bytes

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