Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dabe34b4426ceea…

MALICIOUS

PDF

84.2 KB Created: 2021-03-15 00:57:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 540d6e3d2b85997b9504362b8304d7ef SHA-1: 2aa61f957363d85341854f93c0bf0aa11e933d82 SHA-256: 7dabe34b4426ceea81bda1a868a0c3d9db3ff1eee56a06d22875c738a58d870e
164 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 are disguised as legitimate documents, indicating a link farm designed to distribute malware. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and extensive link farm point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/award?keyword=cassandra+database+administration+tutorial+pdf
    • https://zoveponezewuda.weebly.com/uploads/1/3/0/7/130738822/kavut.pdf
    • https://cdn-cms.f-static.net/uploads/4462075/normal_604e8e9fbc43b.pdf
    • https://kebuwusatame.weebly.com/uploads/1/3/5/3/135343151/tokeki.pdf
    • https://revugegan.weebly.com/uploads/1/3/4/6/134682990/nuwuzemogapekog.pdf
    • https://cdn-cms.f-static.net/uploads/4459654/normal_60102e58c641c.pdf
    • https://zekigoduse.weebly.com/uploads/1/3/4/3/134336209/wuxegaxorava.pdf
    • https://rulorakaduf.weebly.com/uploads/1/3/4/4/134480735/49892de2dbe.pdf
    • https://gojajegu.weebly.com/uploads/1/3/6/0/136050346/kefafibu.pdf
    • https://static.s123-cdn-static.com/uploads/4404725/normal_6004c5d273c39.pdf
    • https://static.s123-cdn-static.com/uploads/4459164/normal_5ffe1fc959d41.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3f46bf15-0a8c-4e80-b3e5-a2e3bf90e008.filesusr.com/ugd/8e6e76_e3bbebadf6004895bac0b366ac57c572.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d53d801e-f3a8-4c77-b09f-fce689fcc88d/lowes_trane_air_conditioner_prices.pdf
    • https://uploads.strikinglycdn.com/files/90a8f9d4-4b0d-4d1f-bca7-71b82b2d7ee2/domogotupadafomovuleriwe.pdf
    • https://uploads.strikinglycdn.com/files/1d9fffbe-7f97-4146-9801-54e0c6732428/les_miserables_castle_on_a_cloud_sheet_music.pdf
    • https://uploads.strikinglycdn.com/files/9fc6c3e4-d778-4c37-8726-50ff5e48f2dd/telavomabilekuxojux.pdf
    • https://50aad03f-9d2a-47e6-be13-abd12f321b17.filesusr.com/ugd/3fd638_2c9a6ec5cabd435a89207ffb0be814e2.pdf?index=true
    • https://s3.amazonaws.com/zevutebulaworel/arabic_remix_fi_ha_song.pdf
    • https://3ff4c494-4984-418a-b709-7a5c611cca0a.filesusr.com/ugd/adbee0_868e4eccafe84c26a918fff02d825f2c.pdf?index=true
    • https://s3.amazonaws.com/budovewesekaz/finding_equations_of_straight_line_graphs_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/2e1d2582-2759-4aeb-befc-dc5db1e0cab9/pact_of_the_time_change_cantrips.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_off00010c4a.bin
1010c34ff2a9c9964d8d2299a35253d4284006a64eb64d2256d29c429a7f5ffd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4A 5232 bytes
font_01_sfnt_off00011df1.bin
a78cc9ec8016f02e2c3f853795ca2e474ed3276ebefee899522893e6f4d1be6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF1 11064 bytes

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