Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b0278a76048c14…

MALICIOUS

PDF

78.2 KB Created: 2021-03-16 08:59:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b567f62ab7d4c70f1c141b02c518149 SHA-1: b8a8b971ab730b27244c1da91c147a496e66b290 SHA-256: d7b0278a76048c1441d0cfd8390191dce728abaec5f4f1009008be3b438f51d0
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one pointing to 'vilenefex.ru', suggesting a link farm or phishing attempt. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the PDF structure indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wix?keyword=wheel+of+fortune+movie+title
    • https://cdn.sqhk.co/wuvevalor/jfigKJx/xakazu.pdf
    • https://cdn.sqhk.co/kixagixupo/eYq1fDx/zombie_hunter_king_unlimited_money_apk_download.pdf
    • https://static.s123-cdn-static.com/uploads/4446166/normal_6003d207788fd.pdf
    • https://cdn-cms.f-static.net/uploads/4417119/normal_60501bb770fdc.pdf
    • https://cdn.sqhk.co/devepogisog/ghghqkh/15566861165.pdf
    • https://cdn-cms.f-static.net/uploads/4379491/normal_601ecf26a2929.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jedadokuti/86956204345.pdf
    • https://s3.amazonaws.com/vovabagubajegeb/57278894794.pdf
    • https://s3.amazonaws.com/baposivarabuj/bahubali_1st_part_movie.pdf
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_06a10c85e15a42ed915d58e4724a85c6.pdf?index=true
    • https://s3.amazonaws.com/zuponefi/best_free_odometer_reading_app_for_android.pdf
    • https://s3.amazonaws.com/poguvelefa/comfort_aire_portable_air_conditioner_manual.pdf
    • https://s3.amazonaws.com/dalava/android_games_emulator_for_pc_free.pdf
    • https://c4bedd8b-a3e9-4aa8-9751-a6fde4035b7e.filesusr.com/ugd/037f08_72c29d13b3094f79925e55025cbcaf56.pdf?index=true
    • https://s3.amazonaws.com/gajakelegeza/vmware_workstation_pro_for_mac.pdf
    • https://s3.amazonaws.com/fomaralunex/24514583465.pdf
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_069869628e394ce88567d5c21eea20d4.pdf?index=true
    • https://59b7e61f-9850-45ee-add2-e9646db267e4.filesusr.com/ugd/5b9365_7be10266f66e45ce80fe30fc4b799bd3.pdf?index=true
    • https://s3.amazonaws.com/gazijewevan/musevujirasebojerunosoluz.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_off0000f4ab.bin
49a1c36ae6d77cf3e80600535aff2883e7127f03ff1dd5838b457173297786fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AB 4692 bytes
font_01_sfnt_off00010484.bin
ecf4e85f98774a1d43ebd675da67649d7a38d04fa3dfd220a2fcea76f21dd9e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10484 11456 bytes

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