Malicious PDF — malware analysis report

Static analysis result for SHA-256 93b7ca0b4ad3daa6…

MALICIOUS

PDF

83.2 KB Created: 2021-03-22 15:37:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91a95ff6e36aef3a6080ca6f33d4d943 SHA-1: b5e31cdad2d5b995aec6054a7f4ea518b12bad6c SHA-256: 93b7ca0b4ad3daa61895a2913f00ca380a2838e8e23289ad508de5b6f8d9f043
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior. While no scripts were explicitly extracted, the presence of external URIs and the overall structure strongly suggest the document is designed to redirect users to potentially harmful sites.

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/award?keyword=anticipatory+bail+petition+pdf
    • https://girigituji.weebly.com/uploads/1/3/4/6/134686745/repenuzuvoduwawu.pdf
    • http://bulakirip.getenjoyment.net/cinderella_original_story.pdf
    • http://mamafiposorugul.sportsontheweb.net/chp_ambulance_driver_s_handbook.pdf
    • http://birebap.scienceontheweb.net/rulaj.pdf
    • https://cdn.sqhk.co/tivuzofep/hZQjegg/ordained_to_marry_in_texas.pdf
    • https://jidupedepinamup.weebly.com/uploads/1/3/2/6/132680921/248270.pdf
    • http://xuzobinemipivor.mygamesonline.org/55873592237.pdf
    • http://lumobumekola.getenjoyment.net/ritetemp_thermostat_screen_not_working.pdf
    • http://nakekizedexu.getenjoyment.net/17022840783.pdf
    • http://vijexibat.mywebcommunity.org/39634917045.pdf
    • https://diniporugixufov.weebly.com/uploads/1/3/1/8/131856235/8efcdcda9cf1839.pdf
    • http://xiruzox.mygamesonline.org/zibomizadamuzuxomud.pdf
    • http://tomokatixo.mygamesonline.org/79864218397.pdf
    • https://cdn.sqhk.co/ziveluki/bgdgjp0/nick_fury_death_captain_america_winter_soldier.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kovudefimure.rf.gd/how_much_does_a_murray_riding_lawn_mower_weigh.pdf
    • http://tevedelowudori.epizy.com/76647852263.pdf
    • http://xopozajuve.epizy.com/97596715269.pdf
    • http://potovoz.rf.gd/who_is_opal_in_artemis_fowl.pdf
    • http://bedanodog.rf.gd/dufiwifu.pdf
    • https://uploads.strikinglycdn.com/files/8e3095eb-d577-4f2e-ac64-a1dd235c42c0/critical_hit_5th_edition.pdf
    • https://uploads.strikinglycdn.com/files/ca7f5466-e04e-4a9d-8234-4618d2156eb7/13110504359.pdf
    • https://uploads.strikinglycdn.com/files/45267602-960b-4485-bb1f-df68e55b28f1/mopipubofezeji.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • https://bit.ly/2JdPZgg
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010888.bin
18f4f1e0b4b21ce399023010f01f9d576abf709cf4a220aa961041cfae004ae0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10888 5200 bytes
font_01_sfnt_off00011a52.bin
5cb4b007c80ed781069c93967380b051f5406f324db0ea033ff591d8c4bfb214		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A52 10520 bytes

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