Malicious PDF — malware analysis report

Static analysis result for SHA-256 196fb4e38cfa6072…

MALICIOUS

PDF

83.3 KB Created: 2021-04-04 01:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57d52578e507f55cef823ea98bb7e14c SHA-1: 71c97be6ed0b470d6271be690fb47a2803376b56 SHA-256: 196fb4e38cfa607212ce06ebd2a7eb6d90515eaa39d4ee59e933b26347c53b8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to PDF files with numeric slugs, indicating a link farm or SEO poisoning attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/strik?utm_term=are+smart+scales+good
    • http://vebofituzor.iblogger.org/37048006064.pdf
    • http://qwonder.space/the_queen_of_the_tearling_series_by_erika_johansen4c7h3.pdf
    • http://antileqphh.site/plate_tectonics_free_downloadaicac.pdf
    • https://cdn.sqhk.co/duputokodoz/ngjgiJk/yellowstone_season_1_episode_2_cast.pdf
    • http://regsenatvumen.website/32975191960esfi2.pdf
    • https://cdn-cms.f-static.net/uploads/4424364/normal_604f8ec10af56.pdf
    • https://cdn.sqhk.co/kezavefizi/Lmghbhc/php_dynamic_ecommerce_website_templates_free.pdf
    • http://abanca-electronica.com/rainbow_six_siege_modsfn8o.pdf
    • http://fatokopos.22web.org/siwunovakowagone.pdf
    • https://cdn-cms.f-static.net/uploads/4462374/normal_604d8085e1b9b.pdf
    • http://expo-kit.ru/the_farm_horror_movie_2018ihea9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://vivanosagilule.rf.gd/75885830229.pdf
    • https://c1908cc8-b41e-4b5b-ab1c-53d28a7f2745.filesusr.com/ugd/913720_c1cb2fb692a740e8bae65579f23bfe0d.pdf?index=true
    • https://49b7c339-fea6-4bb3-bf7b-ca47af5263df.filesusr.com/ugd/6ca12d_658f058ff7c64e79a3c8aae6d8d8c2f4.pdf?index=true
    • https://7b806e58-2e0f-4c22-b5e1-e0f71c4d6e86.filesusr.com/ugd/8da65f_8dadccab0a0e4e21b8b7c566b8f71e8e.pdf?index=true
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_8ce73fc451d84088bb2a8ebcc76cad49.pdf?index=true
    • http://beranaja.epizy.com/93497977483.pdf
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_bc0b726d895b437fa964df60a113e161.pdf?index=true
    • https://3f740848-0e57-4b51-8596-564812021bec.filesusr.com/ugd/cbe17c_0f4ac2639dc74b41ae311d707349f3b0.pdf?index=true
    • https://7ef5d8b8-74ac-4e0a-b0a0-fa61ca6462a8.filesusr.com/ugd/23e9be_99c46bc314f6408fbfaa19ce414b595e.pdf?index=true
    • https://46ebecaa-9490-439b-bba6-ee77f1a6ca93.filesusr.com/ugd/cee8a1_a1968953d79c4d96ad589fad8b902b3b.pdf?index=true
    • http://moxododokojuke.epizy.com/samidekiziralokid.pdf
    • https://cf336f9a-6a79-4542-9269-5b62d6eb69dd.filesusr.com/ugd/1daf83_5ee5bf5bf968463ba35cdd20ecfe1139.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9e9.bin
5fe59e5ed19f3c287b4b4fe0039cd50123f3f0587eb9e8baaeeaa453e93331c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E9 4884 bytes
font_01_sfnt_off00010a79.bin
a25a0aeddbdea0ffabf3ebeeb673ef13f9e03267bec91effc77a57e12b2473ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A79 11108 bytes
font_02_sfnt_off0001304a.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1304A 4324 bytes

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