Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8980559ea5364e5…

MALICIOUS

PDF

78.8 KB Created: 2021-05-02 00:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 925979c2f9a059b6fcf5d6c0293272c6 SHA-1: b30c181a008e857f20e6b7d9c72155a8f39606fe SHA-256: b8980559ea5364e5327c16e06b18c4eee8f657136041cdd67dcdab60cb86f2f8
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malicious intent. It contains a large number of external links, suggesting a link farm or redirection mechanism to potentially malicious sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://vilenefex.ru/strik?utm_term=wicked+saints+book+summary
    • http://fujigukatujewu.medianewsonline.com/samsung_wb35f_camera_manual.pdf
    • https://tunajixawovu.weebly.com/uploads/1/3/0/8/130873758/jomuzugu.pdf
    • https://mobajexiv.weebly.com/uploads/1/3/4/4/134455683/zedexexob.pdf
    • https://fujemolubese.weebly.com/uploads/1/3/4/0/134012375/xenura.pdf
    • http://govuled.mywebcommunity.org/18302155919.pdf
    • http://dalifajebuxog.scienceontheweb.net/how_to_change_chime_battery_adt_safewatch_pro_3000.pdf
    • https://rogefuza.weebly.com/uploads/1/3/4/6/134688393/9dbdae298f584a.pdf
    • https://lipijunozawisek.weebly.com/uploads/1/3/4/7/134721324/e361aabcf80af5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2b186c8c-0d85-4cfa-81ca-a3ab7387485d/load_order_guide_skyrim_xbox_one.pdf
    • https://uploads.strikinglycdn.com/files/75add81d-edb0-4452-8e01-88e87901da0f/chemistry_chapter_8_answers.pdf
    • https://uploads.strikinglycdn.com/files/4005e757-a864-4409-8aa0-f9a817073231/1090888585.pdf
    • https://s3.amazonaws.com/wovigebi/gobibosasomazat.pdf
    • https://uploads.strikinglycdn.com/files/d92b0688-1a5a-4efe-885e-9ed5e6cb0b3b/what_is_contract_interpretation.pdf
    • https://s3.amazonaws.com/divelatoxa/gafus.pdf
    • https://s3.amazonaws.com/lekelepowo/autocad_missing_command_box.pdf
    • https://s3.amazonaws.com/pisedij/linetudedufo.pdf
    • https://uploads.strikinglycdn.com/files/0aeec6ac-fbcc-40d4-aead-a99f6b4aded2/california_case_citation_format.pdf
    • https://uploads.strikinglycdn.com/files/9e59d5fb-aae2-4eaa-994d-0d7d7205e53a/doro_1370_mobile_phone_cover.pdf
    • https://uploads.strikinglycdn.com/files/091abb4d-c497-49ad-9369-bfd2a35d88d6/how_to_use_an_asus_router_as_a_repeater.pdf
    • https://uploads.strikinglycdn.com/files/fae7ece1-8a96-4e4a-b206-ef267a29f4b4/how_to_bend_a_2_inch_offset.pdf
    • https://uploads.strikinglycdn.com/files/ddaab7a2-ac99-4c05-bf32-8fbfc23c01a2/the_hacker_playbook_1_vs_2.pdf
    • https://uploads.strikinglycdn.com/files/38a49e78-35e4-42c7-aabf-bab294d4611e/sobevabogobajubese.pdf
    • https://s3.amazonaws.com/baxunaf/85751180318.pdf
    • https://uploads.strikinglycdn.com/files/3fb76a01-f8a7-46b7-9523-da79a96f2c9d/online_model_booking_team_manchester.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_off0000f5cb.bin
be11d8826c1480897afd754a0328fecef2775ff5c1b6678e99a6de2c08578747		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CB 5372 bytes
font_01_sfnt_off0001080d.bin
bc943dda0fcd0f525618ba72d3beaaef03007a750a3d5a6766bff553a955c1da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1080D 11128 bytes

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