Malicious PDF — malware analysis report

Static analysis result for SHA-256 8758c93c37573fc9…

MALICIOUS

PDF

82.6 KB Created: 2021-04-08 10:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 64486d102d288071bcc6b27a801ca418 SHA-1: 7817f11e3acfe2581dc5793cfd07ba7b419a269b SHA-256: 8758c93c37573fc94cc0c8c9536ffbe2a85f36e11245adb579744445a78eb30b
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, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://xezojetit.ru/strik?utm_term=multivariable+calculus+khan+academy+youtube
    • http://kolegutoravi.mygamesonline.org/golongan_antasida.pdf
    • http://ruvinowuge.scienceontheweb.net/49243985693.pdf
    • http://kimujedat.mygamesonline.org/how_to_solve_for_time_given_initial_velocity_and_distance.pdf
    • http://zeriwegitesokom.iblogger.org/a_course_in_probability_theory_chung.pdf
    • http://luxomozuk.mypressonline.com/percy_jackson_and_the_olympians_book_characters.pdf
    • http://xisumagogali.getenjoyment.net/january_2020_printable_calendar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://biboxafidalus.epizy.com/20850071496.pdf
    • http://tagijonegularol.myartsonline.com/17790463643.pdf
    • http://dupepoge.onlinewebshop.net/99500343287.pdf
    • https://s3.amazonaws.com/satudifin/80050603697.pdf
    • http://furizebun.epizy.com/rezezufadi.pdf
    • http://sofibimibojas.myartsonline.com/dibutokogelirifimirom.pdf
    • http://didoruvevesipug.rf.gd/16125167890.pdf
    • http://fapuwuma.epizy.com/66754950933.pdf
    • https://s3.amazonaws.com/vuxalirudidel/melasubozaxevavowi.pdf
    • https://uploads.strikinglycdn.com/files/96245cd3-225f-4bf4-a611-f339272a672f/supply_chain_management_degree_programs_near_me.pdf
    • https://uploads.strikinglycdn.com/files/97b860e9-6862-4a5d-8873-aa21b294aea0/first_aid_usmle_videos.pdf
    • https://uploads.strikinglycdn.com/files/21619cca-b21b-4ab3-8110-4d0e343f924c/how_to_unscrew_a_stuck_metal_lid.pdf
    • https://s3.amazonaws.com/sigobija/celestron_nexstar_6se_telescope_images.pdf
    • http://rusesav.rf.gd/mitevakotevelo.pdf
    • https://s3.amazonaws.com/tetofamuxulil/pirukewonajorabukezabivun.pdf
    • https://uploads.strikinglycdn.com/files/5bc67242-c377-4cf7-b940-b8b165712a21/manual_de_instrues_da_impressora_hp_officejet_4500_desktop.pdf
    • http://wopojofa.atwebpages.com/34521058741.pdf
    • http://kizitupavage.rf.gd/caracteristicas_de_la_edad_media.pdf
    • 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_off0000f6b4.bin
08965febf972c981a173a7e899cde6e8c217c5808d469fddf5c71919434dc5aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B4 5432 bytes
font_01_sfnt_off00010907.bin
75eaa0ef5d8614289832e13dcbe986e153c83718022eeea6a704531d12162f82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10907 10428 bytes
font_02_sfnt_off00012c7b.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7B 4324 bytes

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