Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d3808283c84a5dc…

MALICIOUS

PDF

72.0 KB Created: 2021-03-27 18:00:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0467da4b4c01881017262bdf5b04fea3 SHA-1: c1875d44336a7682afa8b8f33e81e6e180420ae5 SHA-256: 8d3808283c84a5dc3478516c8fad7a506cec836e4c257a2343e0b7efc21bbc91
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The primary malicious URL identified is 'https://nipisod.ru/award?keyword=ars+poetica+pdf+download', which is likely used to distribute further malicious content or phish for credentials. The ClamAV detection and ML classifier also strongly indicate maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/award?keyword=ars+poetica+pdf+download
    • https://jazawimap.weebly.com/uploads/1/3/5/3/135346256/e0bed0954198.pdf
    • https://cdn.sqhk.co/vuzowadijavu/jdgjfhj/rocky_1_music_training.pdf
    • https://cdn.sqhk.co/vatuliwa/hdieuq9/69544476132.pdf
    • https://fivalamividow.weebly.com/uploads/1/3/4/8/134857099/4375763.pdf
    • https://tedawubav.weebly.com/uploads/1/3/4/3/134376018/dc52e80a4ee.pdf
    • https://zokolukesowi.weebly.com/uploads/1/3/0/7/130776120/6738704.pdf
    • https://cdn.sqhk.co/fuvopone/hO4cvJ1/parabozunitukedavizo.pdf
    • https://cdn.sqhk.co/saxezekobida/zjfEDjg/empires_puzzles_epic_match_3_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/metubevozisul/implosion_cracked_apk.pdf
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_829d96d5a0504a4c8952529ebe962152.pdf?index=true
    • https://uploads.strikinglycdn.com/files/32bd68b6-97a1-4622-b44b-0e1c7dbb28cf/how_to_program_genie_pro_stealth_to_car.pdf
    • https://s3.amazonaws.com/xazarujokemus/the_book_of_dragons_nesbit.pdf
    • https://uploads.strikinglycdn.com/files/0409b1b5-87de-4c5d-9cf0-92515a35712d/53529188782.pdf
    • https://s3.amazonaws.com/gurowozenupifi/municipal_sewage_treatment.pdf
    • https://74fc1a11-d445-4ffb-bc6b-7a79e5a65a18.filesusr.com/ugd/097bd5_7b2c3d8034354f53bf5229c2dee62036.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6e21460d-c12b-474a-9b0c-c6d929ec1fb2/massey_ferguson_231_parts_manual.pdf
    • https://uploads.strikinglycdn.com/files/10e6f3e0-d05d-4373-8f84-887c0cb6905f/fapidodikibitoxabim.pdf
    • https://83372c7a-1065-4b07-8284-b64562b46e84.filesusr.com/ugd/035489_c69343279c1c4965a4783cebc994c809.pdf?index=true
    • https://s3.amazonaws.com/genukopapovixo/fixexezolimabeganafitere.pdf
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_f28267a6d1544bbe86f2b2bcad0bef03.pdf?index=true
    • https://s3.amazonaws.com/kotenu/bad_time_simulator.pdf
    • https://uploads.strikinglycdn.com/files/e0c2ba19-a4bb-46fc-b7e3-acd13c0e920d/what_is_root_cause_analysis.pdf
    • https://s3.amazonaws.com/pajukovuxetu/57766387485.pdf
    • https://s3.amazonaws.com/bokexizometun/how_do_you_fix_a_keurig_that_wont_brew_a_full_cup.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8b7.bin
8e9ffa046d6e8b777e633bfaa2659a8e42904bab37f5de205a3a87abdb85cdd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B7 5228 bytes
font_01_sfnt_off0000eaa5.bin
57158d035afbd705b2d8db4ca25b24426fc5474a7621f52e8697587560d6e27b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA5 11824 bytes

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