Malicious PDF — malware analysis report

Static analysis result for SHA-256 26922bd6e0378637…

MALICIOUS

PDF

80.3 KB Created: 2021-05-15 11:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c484bfad554b06b93a558fe75b3b4ab4 SHA-1: 4763eb52444f454c875bd77f6471cf5265e2b1e5 SHA-256: 26922bd6e0378637b764cde2f252387eb2158c2e740a6aecbe0868c71baa56c2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated or use suspicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious websites. No scripts were extracted, but the presence of numerous external URIs points to a watering hole or phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/strik?utm_term=my+family+and+other+animals+series+1987
    • https://cdn.sqhk.co/letonolomo/fPv4J30/86117947164.pdf
    • https://cdn.sqhk.co/tutabalero/swhegfr/sports_trading_cards_template.pdf
    • https://cdn.sqhk.co/sobekalob/Ajh7She/89750370268.pdf
    • http://zorimiba.iblogger.org/herbologia_y_alelopatia.pdf
    • https://cdn.sqhk.co/sigidezok/gghhieR/dj_sound_mixer_download_for_pc.pdf
    • https://cdn.sqhk.co/wuzexesetaba/ji5ibuF/79797165272.pdf
    • https://cdn.sqhk.co/marivefigus/iaQjd5W/reader_s_guide_to_essential_skills_profiles.pdf
    • https://cdn.sqhk.co/sesedazaw/S5k0jfi/verizon_wireless_roadside_assistance_coverage.pdf
    • https://cdn.sqhk.co/pupumukisev/4WQipkL/nfl_football_training_camp_schedules.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kagedatabujo/6161382479.pdf
    • https://s3.amazonaws.com/ravuxudibure/bluestacks_apk_won_t_install.pdf
    • https://f730d15c-1921-46d2-b6d4-288333e40990.filesusr.com/ugd/e2c223_2853efa3e5f24e6e83ac08a0e0214e07.pdf?index=true
    • https://76f5a3e5-08d8-4581-9975-6c1b933a1845.filesusr.com/ugd/dbbd16_7d3a34436bd94b2eb11a3ba521384f51.pdf?index=true
    • http://fisavisifesu.epizy.com/62136896337.pdf
    • http://besipopi.epizy.com/periodic_table_of_elements_list.pdf
    • http://zelekisiwamab.rf.gd/xikomor.pdf
    • https://68358877-4ee6-4e53-94f7-4bd9665c1f53.filesusr.com/ugd/3bbd68_8e174653f51246e98f651db534f81381.pdf?index=true
    • https://s3.amazonaws.com/sulasatevirexo/guideposts_mornings_with_jesus.pdf
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_0b4c2e3f501e4b7280ae036b7cbecf2b.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd46.bin
1067046b4c846cd8892a70368c19bea70ae774af200b5336b2679c2da5dacec5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD46 5736 bytes
font_01_sfnt_off000110ba.bin
1f9dd7ee5c4c71c1a185353805683dbcd2d547b1c3617415b461cccbfead6ac1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110BA 10316 bytes

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