Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f16fbe0665b114…

MALICIOUS

PDF

80.9 KB Created: 2021-03-29 18:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 8edb5e4c8305eec8feaa9a6254dfae0a SHA-1: 899f6fa44d5ae3a8326d973bbacd38b0ac18d143 SHA-256: f9f16fbe0665b1146ca4d30e5e47785a8e89e6aa36032252a62e7f24f1968589
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically appearing as a search result for a book title. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

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/wix?keyword=buy+learn+c+the+hard+way+pdf PDF link annotation
    • https://cdn.sqhk.co/kigoxeni/hcOgdt9/92928174622.pdfIn PDF document text
    • http://wivaserana.mywebcommunity.org/caso_practico_de_auditoria_financiera.pdfIn PDF document text
    • http://fesurowejo.mywebcommunity.org/winazoxawuparadu.pdfIn PDF document text
    • http://simcars.ru/mimidizadofiv7f7n.pdfIn PDF document text
    • http://begavud.iblogger.org/zuloposisubifafafapivarax.pdfIn PDF document text
    • https://cdn.sqhk.co/rajosibakulu/bnyHTth/mp3_player_for_mac_free_download.pdfIn PDF document text
    • https://fuvapevamasazu.weebly.com/uploads/1/3/4/5/134507747/wawurobegin.pdfIn PDF document text
    • https://cdn.sqhk.co/disovaje/xbiaWhf/j2me_loader_para_pc.pdfIn PDF document text
    • http://larokamexi.sportsontheweb.net/sony_xbr-55x850b_remote.pdfIn PDF document text
    • http://sowoxapexemex.sportsontheweb.net/geometria_y_trigonometria_de_baldor.pdfIn PDF document text
    • https://kojiwoxoposegig.weebly.com/uploads/1/3/4/1/134108885/1591270.pdfIn PDF document text
    • http://instgramcopyrightdispute.com/american_journey_dog_food_sold_near_meurcj8.pdfIn PDF document text
    • http://dapovevi.mywebcommunity.org/gadebivoripop.pdfIn PDF document text
    • http://tixshopclub.space/cat_in_the_hat_meme_generatorokqmx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/depigusowipivu.pdfIn PDF document text
    • http://dunixojojulif.epizy.com/wazaf.pdfIn PDF document text
    • http://pimuxexud.epizy.com/fat_face_jeans_size_guide.pdfIn PDF document text
    • http://nosekaj.epizy.com/lp_dan_askep_bblr.pdfIn PDF document text
    • http://rimatos.epizy.com/54726902411.pdfIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/9095459214.pdfIn PDF document text
    • https://s3.amazonaws.com/waduzirader/xusuzuwepefofaxunesati.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_off0000fe44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE44 5308 bytes
SHA-256: a39e66cecc78098ac90bb65adc18545e6e93f3476929d53ad4a4b38b4e29fa6a
font_01_sfnt_off0001106b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106B 11332 bytes
SHA-256: 69294577eeea03624355f0ac9dd1e036738a97cda6a62ee0a0c49c32493e3bb1

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