Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ae2f82b544200cc…

MALICIOUS

PDF

79.8 KB Created: 2021-03-13 22:57:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e122102ae3bb58c0bb41fb6888766c6d SHA-1: 17b758d2fe6d7c6082cdbf1cd1792624f124954f SHA-256: 7ae2f82b544200cc1c8f1dbe1f07757016886da7ef6d1559c90f7e715be8d39f
126 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or distributing further malware. The PDF structure and the presence of external URIs suggest an attempt to lure users to malicious websites, consistent with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=the+wave+book+true+story
    • http://gojavodevagajuw.mygamesonline.org/what_is_the_largest_constellation_in_the_northern_hemisphere.pdf
    • https://cdn.sqhk.co/pewesopefim/siiu9X7/mad_skills_motocross_2_hackeado.pdf
    • http://tamakar.tech/what_is_a_construction_quality_assurance_plan6mj73.pdf
    • http://kevakigev.medianewsonline.com/85247464067.pdf
    • http://vas-rem.ru/bissell_proheat_carpet_cleaner_pump_beltdwt6m.pdf
    • http://look-hotel.com/wurogimu80ul.pdf
    • http://hookup755.fun/public_speaking_anxiety_articleswmoec.pdf
    • http://koponegigat.medianewsonline.com/lalek.pdf
    • http://vseti.life/happy_birthday_punjabi_song_djyoungsteryf8en.pdf
    • http://ergors.space/xitejiretfs6ln.pdf
    • http://walkover.me/what_is_the_price_of_a_liftmaster_garage_door_openerdgr8t.pdf
    • http://gopidap.scienceontheweb.net/biggan_chinta_download.pdf
    • https://cdn.sqhk.co/lowilufape/PjelhfI/zowevewitelisilinizexuz.pdf
    • http://vimabanu.sportsontheweb.net/65503518066.pdf
    • http://xufamorazogubov.sportsontheweb.net/gunibuwi.pdf
    • http://lngcliente.com/70270493538ftwwn.pdf
    • http://lightstart.xyz/cambridge_latin_course_book_1_tremores_answerskd4fo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dokudaruriwiv.atwebpages.com/zevuti.pdf
    • https://989eff4c-946f-4221-9817-1a8d60f2082d.filesusr.com/ugd/7edf14_5f6fe802b544497cbd170a9561d1c152.pdf?index=true
    • https://2c91b947-1dd8-401e-ae91-d595f2f75867.filesusr.com/ugd/0af078_a84ee46683904c819ada376c6f019e1a.pdf?index=true
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_bb8e67bdb8694636a006e7fba0e31e3a.pdf?index=true
    • https://efed9c07-4553-4484-a419-1b844d271aeb.filesusr.com/ugd/6f475a_b75198b88e9646d7ae49104fb5bb2302.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_off0000f9af.bin
d0e7fc650a097907c02fabdc3ece5988ed12c92d598d296956e7fccad55e499b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AF 5148 bytes
font_01_sfnt_off00010b46.bin
3aa4c64d149b22df00820e8d2569049cc1129c2574224f706b82e1cf68deaa5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B46 11224 bytes

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