Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2139ebcb0707275…

MALICIOUS

PDF

88.5 KB Created: 2021-03-02 17:21:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: c461d13082552397aaff5b930f1aeb6d SHA-1: d966a525f689a8026fb13238b1807e73a5698bd7 SHA-256: a2139ebcb070727562637ce102709dc94381a6863aaf87bf7a22d1f2a6839b97
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains a search query that is used as part of the URL, indicating a potential lure to a malicious 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://zajinet.ru/award?keyword=what+does+decameron+mean+in+english PDF link annotation
    • http://instapresent.site/whats_in_a_sonic_ocean_water32s3j.pdfIn PDF document text
    • http://baffer-shop.space/first_aid_merit_badge_requirements_boy_scoutsm9afh.pdfIn PDF document text
    • https://tobivuzulukimu.weebly.com/uploads/1/3/1/3/131384599/nimijimedub.pdfIn PDF document text
    • https://depuxozepol.weebly.com/uploads/1/3/4/3/134377374/2645023.pdfIn PDF document text
    • http://redtea.space/rivasajakumulemizemasibxqsf.pdfIn PDF document text
    • http://bumumapa.mypressonline.com/how_much_is_a_big_green_egg_xl.pdfIn PDF document text
    • http://nesorus.mywebcommunity.org/how_to_program_dish_hopper_54.0_remote_to_tv.pdfIn PDF document text
    • http://cupe1.ru/juditamukafosawukiryo4zf.pdfIn PDF document text
    • http://alexsaf.ru/icap_business_law_book_download15x2a.pdfIn PDF document text
    • https://cdn.sqhk.co/begokaxawip/Oihjcgg/49068128361.pdfIn PDF document text
    • http://dimopun.mywebcommunity.org/gurewaborijisosiganedite.pdfIn PDF document text
    • https://cdn.sqhk.co/vexapalas/DYidgd6/shadow_fighter_film.pdfIn PDF document text
    • http://xovumajinobog.iblogger.org/6727610627.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/hhsN8jd/go_karts_las_vegas_nv.pdfIn PDF document text
    • https://wokopapun.weebly.com/uploads/1/3/5/3/135388848/74f7a.pdfIn PDF document text
    • http://zoomita.fun/20570366550keup2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rimivumukox.epizy.com/16587280820.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_off00011d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D59 5364 bytes
SHA-256: 79ffe336134c102d7f7e6b477d999ccbdfa4273fed0ec72eee2a3ced39d6cb7f
font_01_sfnt_off00012f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F76 10428 bytes
SHA-256: 60828f011af6844b0ad2a529735271133316e064c23bf9080b8a1d36ffafc1d3

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