Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d92e893ab056534…

MALICIOUS

PDF

75.9 KB Created: 2021-04-02 23:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9b338f200de000e5b1a2d20703d56fa SHA-1: b18a9269c82e298e2b786b2f84e5b8adba1d89f5 SHA-256: 6d92e893ab0565348479e84b1bba9e4052b893f5438723a9b26146055524a585
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document body and embedded URLs suggest a lure for free antivirus software, which is a common phishing tactic. The presence of numerous external URIs, many hosted on disposable domains, further supports a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/123?utm_term=antivirus+para+pc+gratis
    • http://health2health.online/what_is_negative_space_in_graphic_designefesh.pdf
    • http://muldwych.com/toshiba_d-rw2_dvd_player_recorder_manualp4dpq.pdf
    • http://islta.fun/whatsapp_plus_free_for_iphone_66cswb.pdf
    • http://xejevojesinil.22web.org/vuduxavunanix.pdf
    • http://baltika-trans.ru/where_is_the_battery_located_in_a_2012_jeep_grand_cherokee_laredoewwmi.pdf
    • http://cuzinfo.ru/daily_fountain_devotional_guideicsjr.pdf
    • http://file-id.ru/lumironexidesuvxvdly.pdf
    • http://help-igcopyright.xyz/795028247401nff9.pdf
    • http://pasetbs.xyz/asterix_et_obelix_mission_cleopatrev6nf6.pdf
    • http://hamlikjorettoop.ru/1942_classic_arcade_app_storerd793.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://weralawubuzeg.epizy.com/lung_transplant_immunosuppression_guidelines.pdf
    • https://uploads.strikinglycdn.com/files/d42bbbcb-17fb-48bd-98a7-e2cb629bc133/laramie_project_characters.pdf
    • https://uploads.strikinglycdn.com/files/142e2295-6b54-4ee9-b0bf-6ea5b4b59cf4/deleruje.pdf
    • https://e6a48395-9ebc-465e-8505-c4b20d7b8e72.filesusr.com/ugd/81e12b_6e857ddea4ec4edaa107a46aab02bff1.pdf?index=true
    • http://wupofopevina.epizy.com/miwugodisalotan.pdf
    • https://e57d8632-f742-4524-ada6-9cdf759d9f13.filesusr.com/ugd/b0cb2d_42325daaccae439298d16e13f8f59475.pdf?index=true
    • https://c504e2ef-f928-4e80-b5b1-fc05046f432e.filesusr.com/ugd/247f25_759d11985a4e46719763701ee4b15a8a.pdf?index=true
    • https://s3.amazonaws.com/pisedij/cognitive_behavioural_therapy_schizophrenia_review.pdf
    • https://s3.amazonaws.com/lowuwofuxali/xefilomujurubizobojugu.pdf
    • http://golagesobowe.epizy.com/chrome_android_plugins.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_off0000eb78.bin
8b6cc74745d115912be919d6e7ae529f0145bbb741a6b32c6965a439b7ce5cf0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB78 5116 bytes
font_01_sfnt_off0000fcf8.bin
bf0a5fea7555481cfd25030088534a4e921911406084ac69fc2aac6b5e3dcb34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF8 10996 bytes

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