Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5951a38103844f8…

MALICIOUS

PDF

95.9 KB Created: 2021-03-14 21:40:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 0ae22f0c09856b671591d86f54f08646 SHA-1: d4191da04c41ada71118a01a7c83638a74f42026 SHA-256: a5951a38103844f88a882e27a634f7ca85850ae62d5057c59837d0d884badad7
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to a link farm designed to redirect users. The 'ML_NYX_PDF_MALICIOUS' heuristic and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains keywords related to the embedded URL, suggesting a lure to a phishing or malware distribution site.

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://vilenefex.ru/wix?keyword=smithing+guide+ffxiv PDF link annotation
    • https://cdn.sqhk.co/jomububorava/ojfAUgd/mtb_downhill_multiplayer_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/zizaratijiga/dTiaPjh/3743532558.pdfIn PDF document text
    • http://kuxufijum.iblogger.org/disubuxijilokenoforoko.pdfIn PDF document text
    • https://cdn.sqhk.co/latosagax/huFzIq4/candy_crush_jelly_saga_download_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/zXhdIgj/papuzepajez.pdfIn PDF document text
    • https://cdn.sqhk.co/wivesuvuvu/Uhjhahc/79539301888.pdfIn PDF document text
    • https://cdn.sqhk.co/penunotati/hh4ejj2/tap_tap_builder_online_generator.pdfIn PDF document text
    • http://lenagilos.22web.org/xumowepofojesawajebo.pdfIn PDF document text
    • http://wisevesimo.22web.org/20982059479.pdfIn PDF document text
    • http://rejasikega.scienceontheweb.net/lg_washing_machine_manual_inverter_direct_drive.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/kevava/57006011948.pdfIn PDF document text
    • http://gazinuxifo.epizy.com/physics_textbook_high_school.pdfIn PDF document text
    • http://bitujavoza.epizy.com/where_can_i_get_my_dyson_refurbished.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/dd_warlock_subclasses_homebrew.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/76169154636.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/aarambam_songs_telugu_free.pdfIn PDF document text
    • http://tiwosutodegadax.onlinewebshop.net/3745288188.pdfIn PDF document text
    • http://dixolasafu.epizy.com/11260416572.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/44575167308.pdfIn PDF document text
    • http://xezujuwevan.epizy.com/residential_electrical_installation_guide.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_off0001395f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1395F 5036 bytes
SHA-256: 1c2b9504e96dcade38742ecc595f6af6f38d77819b3e76afcccd842fa185dc88
font_01_sfnt_off00014a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A6C 11748 bytes
SHA-256: 356c610ca4f41354c29ece54daaaa6a426e30b367ea5f46c12f604bb3dab08c8

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