Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9f2f0d40e3ef322…

MALICIOUS

PDF

74.3 KB Created: 2021-03-03 05:19:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 65ed624fa70704c810b4b2301eeb9d3e SHA-1: fcf25fe6be35a37dfe22ca77ab37b83944a4ebbf SHA-256: c9f2f0d40e3ef3225ec36ac15f620e0ea70f7695191de3bc897c66c05eb1dbed
126 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to 'nipisod.ru', suggesting it acts as a lure to a phishing or malware distribution site. The document's structure and numerous links indicate it is a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/strik?utm_term=how+much+is+a+2011+rav4+worth PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426822/normal_600fabfef2c2e.pdfIn PDF document text
    • http://wogivodugakovek.mygamesonline.org/71473231858.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385010/normal_5feb940ecb19f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407064/normal_5ff755e0687d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408878/normal_5ff991191ad9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381738/normal_60192c855abc6.pdfIn PDF document text
    • https://cdn.sqhk.co/fiduzosi/d0Ehd9x/he_doesn_t_love_me_anymore.pdfIn PDF document text
    • https://cdn.sqhk.co/wibezudak/fYWYrib/jelurodigisid.pdfIn PDF document text
    • https://cdn.sqhk.co/xekutenupi/Liijh9G/farm_animal_rider_zoo_safari_park.pdfIn PDF document text
    • http://poxumanavofeboz.scienceontheweb.net/garmin_nuvi_2595lmt_sd_card.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxogubajo/hishjBH/64752770306.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuputes.atwebpages.com/lg_inverter_direct_drive_error_code_ae.pdfIn PDF document text
    • http://perexuwofogefo.onlinewebshop.net/ge_jvm7195skss_stores.pdfIn PDF document text
    • http://domuromu.atwebpages.com/6815645458.pdfIn PDF document text
    • http://bexukavibume.myartsonline.com/56303915099.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_off0000e4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E3 5536 bytes
SHA-256: f259bddf249a2eae5944bce94c90169651a6b6aa6a5a63e889562ad154f165c3
font_01_sfnt_off0000f7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A9 10620 bytes
SHA-256: 72f774d663a18100d190f6b4297da7750ab62a2bf8f4960401b11ece7e56b7a2

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