Malicious PDF — malware analysis report

Static analysis result for SHA-256 961284dad4b1b224…

MALICIOUS

PDF

75.7 KB Created: 2021-02-15 19:47:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 24932a7408ce32839e2cba4c725595d2 SHA-1: a2a4564cc45931cacd3c4661b0bfac1b5dde7827 SHA-256: 961284dad4b1b2241252566cd497d0b7c99b4f625416c688e4c20a842c6ffa97
176 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://jacksth.ru/wb?keyword=forgiveness%20quotes%20marathi PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383922/normal_6021a5fe4a1d9.pdfIn PDF document text
    • https://cdn.sqhk.co/pifixijowoka/cUjbagc/puzz_3d_disney_castle.pdfIn PDF document text
    • https://cdn.sqhk.co/bijukipuj/igFXjJF/68538852579.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486051/normal_601458984b956.pdfIn macro / runtime command snippet
    • https://cdn.sqhk.co/rojawamusula/gSShfhf/actor_tycoon_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406514/normal_601990a6c06de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366401/normal_6004f6d0e99bd.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/VOghige/45560251732.pdfIn PDF document text
    • https://cdn.sqhk.co/bIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/patilawasu/juvumeli.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/bird_box_book_online.pdfIn PDF document text
    • https://s3.amazonaws.com/lowebemuwojiso/format_powershell_code_visual_studio_code.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/cisco_anyconnect_android_free.pdfIn macro / runtime command snippet
    • https://s3.amazonaws.com/votubukaxogilix/chemistry_atomic_number_and_mass_number_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/dairy_industry_wastewater_treatment.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/45299506651.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_off0000ecc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC7 5208 bytes
SHA-256: 3ef2d6f9e9b32980a0510ffae5d8a1de64b750b167fbe2dfb2e91245aa1ed02d
font_01_sfnt_off0000fe5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5D 10608 bytes
SHA-256: 6d787937106a8d0dbf9ad0b329da8030eae9e6074a3b38da6b361ffba7e8648b

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