Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dc5fad6ac9abd22…

MALICIOUS

PDF

82.1 KB Created: 2021-02-17 11:51:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e1f9a591f0e9d5344540c3fd4c44e305 SHA-1: 690ce534e5e95d67142fc14243e6d4707e1bed94 SHA-256: 8dc5fad6ac9abd22f976394c2fa7d4665e2ebea0af70588e6b9f1174b2ab982d
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 point to other PDF files, suggesting a link farm or a distribution mechanism for malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of external URIs points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://baarspo.ru/123?utm_term=corporate+finance+institute+income+statement PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4483854/normal_602c3fad25362.pdfIn PDF document text
    • http://workbykoder.xyz/gesofefiwopenofufeditozep1esjq.pdfIn PDF document text
    • http://dorodirebupekel.iblogger.org/31364711578.pdfIn PDF document text
    • http://sodahub.pro/destiny_2_raid_chest_solo_guidewtlk0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491723/normal_5fed72765edaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405186/normal_5fefd1a9b0afe.pdfIn PDF document text
    • http://lifeeuro.info/paradise_low_voltage_transformer_manual2pmnz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464852/normal_5feb92a0a92e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480735/normal_5fe6958b4e3dc.pdfIn PDF document text
    • https://wirosumarot.weebly.com/uploads/1/3/1/3/131398493/5710572.pdfIn PDF document text
    • http://nat-fru.space/best_quran_tafseer_book_in_englishnvn0v.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483388/normal_5fedfc5db340b.pdfIn PDF document text
    • https://lepitedow.weebly.com/uploads/1/3/4/8/134885181/9913e6a8e78384b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rigutogivopum.epizy.com/play_store_app_install_old.pdfIn PDF document text
    • http://durezalur.epizy.com/blacklight_retribution_game_for_pc.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001053d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053D 5036 bytes
SHA-256: 633f5abce09007efc4dbd2fc3f7ac2afa17ac071fbf4d5437112ee09390874ef
font_01_sfnt_off00011643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11643 10796 bytes
SHA-256: ccab09a227ca44bc9e70f18b4a071091be21d852c92bd5cd49a697bd695f24b2

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