Malicious PDF — malware analysis report

Static analysis result for SHA-256 608a2681067d3ed0…

MALICIOUS

PDF

73.0 KB Created: 2021-03-27 18:15:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8ed617d08692fd3da15071c13c4bca4c SHA-1: b337213aa6e1737705cb7251018b1ea4e54937a0 SHA-256: 608a2681067d3ed0b25fabdb71002427ceda6ccdc51ba196d443271cb3ca11ec
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://midufefew.ru/123?utm_term=english+word+stress+exercises+pdf PDF link annotation
    • http://gubuxuk.scienceontheweb.net/73613268636.pdfIn PDF document text
    • https://cdn.sqhk.co/bubiwalifeda/igU5sEb/entire_world_map_of_game_of_thrones.pdfIn PDF document text
    • http://topstop.site/884207976431gg7x.pdfIn PDF document text
    • https://cdn.sqhk.co/jutusaxibu/jpjbxha/inflatable_super_backyard_water_slide.pdfIn PDF document text
    • https://cdn.sqhk.co/motuwezelu/eeLC52V/bingo_musica_infantil_letra.pdfIn PDF document text
    • http://tafagejiveduda.22web.org/landmarks_in_humanities_gloria_fiero.pdfIn PDF document text
    • http://littlenat.space/pinotobakupekakodsusl5.pdfIn PDF document text
    • https://cdn.sqhk.co/jukunobegabe/aOJnRgf/nfs_heat_studio_mod_apk.pdfIn PDF document text
    • http://trastenmyqort.online/multiplication_and_division_of_rational_algebraic_expressions_worksheetswmihd.pdfIn PDF document text
    • https://cdn.sqhk.co/wukufazujuv/gf8jgic/horizon_blue_cross_blue_shield_dental_choice_plan.pdfIn PDF document text
    • http://zathkatow.xyz/can_you_use_a_wifi_extender_with_fioscojb9.pdfIn PDF document text
    • https://cdn.sqhk.co/dixejetafap/O6V5hgS/gedufevo.pdfIn PDF document text
    • https://cdn.sqhk.co/bexuxoxabim/D2z1ia0/hole._io_unblocked_games_at_school.pdfIn PDF document text
    • http://talkme-news.info/14620993167vq1q8.pdfIn PDF document text
    • http://zesonel.22web.org/wotatuzud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://69f1164a-dcd3-4310-9fb4-3b67f03bdbb0.filesusr.com/ugd/9d7282_aa0fe5c2881043289ef33277cefe170f.pdf?index=trueIn PDF document text
    • https://3a00e800-a8eb-44ae-aafc-ae9aecab8e06.filesusr.com/ugd/1715bf_f155f5c497314d5eaad34066e9ee7c9c.pdf?index=trueIn PDF document text
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_328a25ec0735456399ba11558516a2ba.pdf?index=trueIn PDF document text
    • http://sajatuvireguta.atwebpages.com/tecnologia_da_informao_concurso.pdfIn PDF document text
    • http://kadegezopofog.rf.gd/semutetufadatofita.pdfIn PDF document text
    • http://febarufowit.epizy.com/buffer_ph.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA6 5324 bytes
SHA-256: a98ba8b0e6f5695eba56b592a05cff670508fb3d6664141c9be1dd10f14f1b82
font_01_sfnt_off0000f1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E1 10996 bytes
SHA-256: 07bdef1a678d6270aee09a271ff4cbc409d9e4722705615f2f1c759f7f90cbb6

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