Malicious PDF — malware analysis report

Static analysis result for SHA-256 aad9b6d8e11b334f…

MALICIOUS

PDF

91.3 KB Created: 2021-03-29 15:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99530624d31bbbf657ede2d14ce0ee66 SHA-1: 4ea8823f8589926d3111ea312e4f2431eda1b991 SHA-256: aad9b6d8e11b334f30dbaafe8449467779584a242171f0b2e44af7ed5a1e7379
126 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs, with a primary focus on a link to 'golowaki.ru' presented as a search result for 'cassia county warrants'. This suggests a phishing or credential harvesting attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via the linked site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/wix?keyword=cassia+county+warrants
    • https://cdn-cms.f-static.net/uploads/4465125/normal_60494f239b624.pdf
    • https://cdn-cms.f-static.net/uploads/4452395/normal_5fe7150d89700.pdf
    • http://xokebidukefu.getenjoyment.net/rational_functions_multiple_choice_test.pdf
    • http://lotobajigufar.mywebcommunity.org/la_cuisine_algrienne_livre.pdf
    • http://larokamexi.sportsontheweb.net/35133709496.pdf
    • http://sajiwurejedetu.sportsontheweb.net/zabefefititixapelezo.pdf
    • https://cdn-cms.f-static.net/uploads/4470677/normal_6046e24d4670b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xawiwevivuzox.onlinewebshop.net/south_africa_national_anthem_sheet_music.pdf
    • https://s3.amazonaws.com/zubuwujoxom/not_fade_away_guitar_tabs_rolling_stones.pdf
    • https://uploads.strikinglycdn.com/files/88686d9c-3f57-4997-ba2a-1bcf38611923/cultural_theory_and_popular_culture_summary.pdf
    • https://uploads.strikinglycdn.com/files/4085a1ce-20d2-4725-b488-d482183a3661/how_do_you_start_a_private_investigation_business.pdf
    • https://s3.amazonaws.com/tokudapele/rafitepif.pdf
    • https://s3.amazonaws.com/babetafaperaxov/why_are_school_rules_important_to_follow.pdf
    • https://s3.amazonaws.com/patotale/pedadivetutuju.pdf
    • https://uploads.strikinglycdn.com/files/8ac37e7c-2126-43cb-a67c-9e678a1852ed/problemas_de_porcentajes_4_eso_aplicadas.pdf
    • http://gataluxogawix.epizy.com/riwasatumesozigazonab.pdf
    • https://uploads.strikinglycdn.com/files/1fa77200-4843-4a53-8d1d-b1f2da160b01/how_much_do_car_service_cost.pdf
    • https://1ceef7f3-d523-4f80-a0a4-3aed54d3d17a.filesusr.com/ugd/48841a_b2c73dbaac6045adb1bce177706361d2.pdf?index=true
    • https://s3.amazonaws.com/rozebofukixus/52805617674.pdf
    • http://xajuvezovaguze.rf.gd/context_clues_worksheets_5th_grade_free.pdf
    • https://1fae3a98-13b7-4b95-b1f0-1fbd1b7b0aee.filesusr.com/ugd/1da05d_3bb5a6761d174b78a26558846c336a6f.pdf?index=true
    • https://5f1c1209-45f6-45c0-988a-e0aaa04be055.filesusr.com/ugd/ba5820_380c43e95f0740a08dea88575055cdf6.pdf?index=true
    • https://70745723-7f4a-4dc7-98be-95bdce43cd82.filesusr.com/ugd/67bae7_f52bf6abdf994e25a164865c148e0cf1.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_off00012ac5.bin
d9bab16dc64aec52e0fa1b3a5a1d83c773b2889360aa574c9387e0fdff342afe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC5 4860 bytes
font_01_sfnt_off00013b69.bin
6331aaf29f68d134bca1393cba01f6d05d456d763e81c743969980ca56a2f74f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B69 10836 bytes

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