Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bf30c519a3b70c5…

MALICIOUS

PDF

73.8 KB Created: 2021-04-16 07:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13640bcf31cb8127139fda7722902417 SHA-1: 365433fc4adaf04efb850485a85f9e6183328d8f SHA-256: 1bf30c519a3b70c583671ea2fff399333369a1345ded30483b5f30221a1caf9a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm designed for SEO manipulation. One prominent link, 'https://zajinet.ru/strik?utm_term=ancient+world+history+textbook+pdf', is presented as a history textbook, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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
  • 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://zajinet.ru/strik?utm_term=ancient+world+history+textbook+pdf
    • http://takovevagagiv.scienceontheweb.net/98073833728.pdf
    • http://about-central.com/75313527200lulb7.pdf
    • http://rotirir.mypressonline.com/artritis_reumatoidea_seronegativa.pdf
    • http://rukozhop-guide.com/dd_players_handbook_free_downloadfsbjo.pdf
    • http://kyponnik.online/three_sisters_story_anton_chekhov68h37.pdf
    • http://dajobod.getenjoyment.net/nidat.pdf
    • http://jifarobajis.sportsontheweb.net/34767361381.pdf
    • http://instgramcopyrightdispute.com/copperplate_calligraphy_bookshjv8f.pdf
    • http://minuette.me/canned_heat_on_the_road_again_album_cover57r7g.pdf
    • http://euroshopmn.space/19436708513twxrm.pdf
    • http://dhl-order.info/revabaminokekugusilop5ps.pdf
    • http://snail-case.store/44166892389ngovq.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xoxekojut.onlinewebshop.net/84340118219.pdf
    • https://8964868a-aef6-4da0-9a9b-29de7c28e0c5.filesusr.com/ugd/b910ae_1df09b0c45764cb48b4dc9482c10a0cd.pdf?index=true
    • https://6cb1c90e-07cf-4522-b85d-4edd8abc33c8.filesusr.com/ugd/0c41e7_bb5eb3fc73af40e3a1ed1fd37386f119.pdf?index=true
    • https://264cdfe8-48fc-440e-bff3-938583425051.filesusr.com/ugd/cd20dc_a078cb7cacca4de8a9f7d0d1884f460c.pdf?index=true
    • https://s3.amazonaws.com/busutafitufe/nomination_form_template.pdf
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_2a3bddd607474d238c3d47ae8ea36c82.pdf?index=true
    • https://d926c97b-7f3b-4ec8-a52a-318bcb589338.filesusr.com/ugd/120f26_81fa1db98aa64f16ad06dad6e7a153dc.pdf?index=true
    • https://def26600-86c9-4442-a738-094ddf2992d1.filesusr.com/ugd/eb5a6a_d63428be65b54215ad24d2955eda3bab.pdf?index=true
    • https://s3.amazonaws.com/simujix/dusafakofefogulugetupotet.pdf
    • https://s3.amazonaws.com/fefurorobumi/97553023890.pdf
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_f97c7b68181041aa9fcb26418942096e.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_off0000e27e.bin
7dbac5638eec7de214c15c74087a8120a8a0a772d84d29e1a542bacb741b79c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE27E 5488 bytes
font_01_sfnt_off0000f53a.bin
5de9ffbf15eeb833b11ba86db20374e09dadc20879469f86abb064db1858b10d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF53A 10788 bytes

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