Malicious PDF — malware analysis report

Static analysis result for SHA-256 00b0f716f1526df9…

MALICIOUS

PDF

76.9 KB Created: 2021-03-19 23:25:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f266684c5887b07a5bcdfb10dbef07d1 SHA-1: a9055442476bb3bc4c2dae619de30d915e9a71d2 SHA-256: 00b0f716f1526df96b17106f781466b559af2e25eec304fd0885032f08d632c3
164 Risk Score

Malware Insights

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

The file is a PDF containing numerous external links, with one prominent link pointing to a suspicious domain associated with SEO spam and potential phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a 'download button' heuristic further supports the lure mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://midufefew.ru/wix?keyword=reptiles+worksheets+for+preschoolers
    • http://wowevopopof.22web.org/chaalbaaz_bengali_movie_720p.pdf
    • http://dojaligiwojop.22web.org/certificate_of_appreciation_format.pdf
    • https://cdn.sqhk.co/sunaxidida/PP5wwgh/free_download_game_zombie_tsunami_for_pc.pdf
    • https://cdn.sqhk.co/dulunukosep/dgdidgc/camp_rock_songs_musicpleer.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/95a46365-e956-498d-b1b6-44cc6045a955/85588638466.pdf
    • https://s3.amazonaws.com/zakunafu/samsung_g611f_cf_auto_root_file.pdf
    • https://2d130471-2a64-48ba-87cf-8f1e86c6acad.filesusr.com/ugd/9c43ec_05d2883546a74e21aeca8edaabc93e9d.pdf?index=true
    • http://wozaxanakix.epizy.com/puxuturigumo.pdf
    • https://d05b2b94-0af3-401c-a6ef-75d00d0b58ae.filesusr.com/ugd/3bca44_13766eb90d1c4bee896eafd3172d4c33.pdf?index=true
    • https://s3.amazonaws.com/voxipanovigepiv/bumuwipipeguvefawib.pdf
    • https://uploads.strikinglycdn.com/files/3d474988-2190-43cb-948a-03ed8fdf6d05/senior_network_administrator_interview_questions_and_answers.pdf
    • https://uploads.strikinglycdn.com/files/ba90426e-8011-4e38-90af-caf0aa7161e8/sylvia_the_goat_play.pdf
    • https://uploads.strikinglycdn.com/files/52c954a9-78d6-4dac-a760-363333345f97/58644381830.pdf
    • https://ecab545c-19d2-4654-b6ac-fb8b9749f5ba.filesusr.com/ugd/e5412a_a2a6c13d1cfc4c368db52ea634c42c8f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7dbfeb9d-ddf1-4562-bdce-eecdc9b9d228/coby_intense_wireless_earbuds_review.pdf
    • https://s3.amazonaws.com/dosalapasenow/template_for_wedding_envelope_printing.pdf
    • http://pidifuwamofuw.epizy.com/dyson_dc18_disassembly.pdf
    • https://uploads.strikinglycdn.com/files/7c800789-02ce-4b63-8fdf-2f4c9f3c7045/what_is_organizational_structure_in_financial_management.pdf
    • https://204833c8-abda-4421-8777-5048ee7dd919.filesusr.com/ugd/e30b7a_8de7ce05f61045688a5d1dcb6ea43b86.pdf?index=true
    • https://2cc12256-1025-444a-bacb-901a9f007bda.filesusr.com/ugd/d1fcfc_efb922b2ac90455385c94e1df9d89c5e.pdf?index=true
    • http://fapugiv.rf.gd/bhakta_kannappa_telugu_audio_songs_free.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_off0000ed46.bin
cb1f1e9111bcdafe514f2f96b797c2e8eefa2a3b2c607a7057a10df50f64d0e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED46 5056 bytes
font_01_sfnt_off0000fe8c.bin
7cc971a854702d2e85ba3d689c5bbf6f75081c5a86292e76308a4ffd4fa76f4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8C 11664 bytes

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