Malicious PDF — malware analysis report

Static analysis result for SHA-256 d96f21edbd27d335…

MALICIOUS

PDF

76.3 KB Created: 2021-06-06 00:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 7fc9b68c360edade4b75880192d30f2b SHA-1: 0a702348af9c89d299cc762063366ea46be0c228 SHA-256: d96f21edbd27d33596cba4fee014a09662045376aa61108989daa97837f8a74f
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm designed to redirect users to external sites, with one prominent URL being https://xajibur.ru/123?utm_term=blackjack+game+free++for+windows+7. This URL, combined with the ML and ClamAV detections, strongly suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to 'Blackjack game free for windows 7', reinforcing the lure.

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://xajibur.ru/123?utm_term=blackjack+game+free++for+windows+7 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4503791/normal_60519856a0b5c.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4451374/normal_60b1a61facec5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460255/normal_6011518b935c3.pdfIn PDF document text
    • https://wizaxonaguwaxi.weebly.com/uploads/1/3/4/3/134306690/6749ff288c3e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376629/normal_5ffae900daa6e.pdfIn PDF document text
    • https://lewelekokoje.weebly.com/uploads/1/3/4/3/134333059/00449abe9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426960/normal_5fd62c7fb49ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495037/normal_5fe51299d8a36.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wasazejis.pbworks.com/f/download_messenger_for_blackberry_z30.pdfIn PDF document text
    • http://vadibun.pbworks.com/f/fatalities_mortal_kombat_trilogy_android_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f16b3197-250f-477a-9dcc-b8681bdf5303/club_dead_full_movie_in_hindi_download_720p_bluray.pdfIn PDF document text
    • http://taxexuwej.pbworks.com/f/computer_networking_basics_tutorial.pdfIn PDF document text
    • http://jozeluwofe.pbworks.com/w/file/fetch/144609222/duwidedisaweve.pdfIn PDF document text
    • http://minuwaxiper.pbworks.com/f/mechatronics_book_by_k_p_ramachandran_download.pdfIn PDF document text
    • http://pidexuxok.pbworks.com/f/59269988520.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0492269e-672d-41f5-8286-495e3af6b814/how_much_do_medical_interpreters_make_in_washington_state.pdfIn PDF document text
    • http://paderukut.pbworks.com/f/essentials_of_biological_anthropology_4th_edition_larsen_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0b72cba-8b68-4dd2-acec-2c8c35473220/canon_pixma_mx922_printer_price.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_off0000ec4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4B 5700 bytes
SHA-256: 422fea063d8b1a702febea0abb9713562a67fa8441ff2cee6c86aabd6f1160fd
font_01_sfnt_off0000ffbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBD 10684 bytes
SHA-256: f82dcb8e173bf856df8169c5570ad25645c88e0022d3d70ed1edcb7e99da6a7d

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