Malicious PDF — malware analysis report

Static analysis result for SHA-256 22473e73348ccaed…

MALICIOUS

PDF

72.5 KB Created: 2021-02-25 09:00:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4c6dab3a729c22a08dd5a94edbf713f8 SHA-1: 890942863418c6497cafae4b9ee91e75839ddfae SHA-256: 22473e73348ccaed8e1242b136993e6869dfc5d84a46b3a5530e91853ee441f6
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs, one of which is a redirector pointing to 'https://jacksth.ru/strik'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple PDF links, suggesting a spam or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

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://jacksth.ru/strik?utm_term=jean+baudrillard+simulacra+and+simulation+citation PDF link annotation
    • http://nizavevorupuj.mywebcommunity.org/ies_lighting_handbook_10th.pdfIn PDF document text
    • http://lexusesadedebaz.22web.org/free_audio_reader_for_windows_7.pdfIn PDF document text
    • https://nazalufu.weebly.com/uploads/1/3/1/4/131409274/tokonamigu.pdfIn PDF document text
    • http://xufelaketodo.getenjoyment.net/73147920204.pdfIn PDF document text
    • http://fazejajogavu.medianewsonline.com/64918542775.pdfIn PDF document text
    • https://zoguripan.weebly.com/uploads/1/3/1/0/131070442/59f5c3bcad.pdfIn PDF document text
    • http://kojazunupetip.mygamesonline.org/types_of_war_memorials.pdfIn PDF document text
    • http://tezibif.mygamesonline.org/90024117013.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jabodegodonirad.atwebpages.com/quais_so_os_tipos_de_artes_plsticas.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/budismo_moderno_3.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/38108021901.pdfIn PDF document text
    • http://diwavubodinaroj.myartsonline.com/75236306732.pdfIn PDF document text
    • http://kepofif.onlinewebshop.net/how_can_i_reduce_my_dish_network_bill.pdfIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/assassin_s_creed_movie_in_tamil_tamilrockers.pdfIn PDF document text
    • http://mukanebesiva.atwebpages.com/microwave_turntable_not_turning_and_not_heating.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_off0000df06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF06 5216 bytes
SHA-256: 59a5778ba095c924a7e9b1b91f59cb4430fcea13ddcf69be47720e225cc054b9
font_01_sfnt_off0000f0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A8 10672 bytes
SHA-256: 852e9ad350b8ded294e12e713a523e8c890cd527e0828685b26f98b25b3571a0

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