Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8917480a00aaac1…

MALICIOUS

PDF

95.7 KB Created: 2021-03-28 18:42:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a630c0d84995785b1b0e91e8aced2eb1 SHA-1: b045c49a03c0e8060dfd00b243c00e4f05599b9d SHA-256: c8917480a00aaac152d8063c735f42d898069ad9eb1a6afa2d84bcc631d22259
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://fokemale.ru/123?utm_term=ambition+verb+form PDF link annotation
    • http://idealslim-italiaoficial.site/best_fingerpicking_electric_guitarists34mjz.pdfIn PDF document text
    • https://podogavefa.weebly.com/uploads/1/3/1/4/131438056/goralu.pdfIn PDF document text
    • https://gujibimusexuwub.weebly.com/uploads/1/3/4/0/134042380/5001481.pdfIn PDF document text
    • http://nat-yoga.space/best_aluminium_road_bike_2016y5ek0.pdfIn PDF document text
    • https://resevaguwitim.weebly.com/uploads/1/3/5/2/135298688/01b9f3e7004.pdfIn PDF document text
    • https://cdn.sqhk.co/kapimetavis/iefp8fi/53668287254.pdfIn PDF document text
    • https://cdn.sqhk.co/jesisuvov/jbTjdjc/lotibisonopojir.pdfIn PDF document text
    • http://khareedforosh.com/511269955792w70y.pdfIn PDF document text
    • https://zunimivivonuz.weebly.com/uploads/1/3/4/0/134017399/7539025.pdfIn PDF document text
    • https://xisuviwilizej.weebly.com/uploads/1/3/4/3/134320176/foxik.pdfIn PDF document text
    • http://ukrdomonis.xyz/58766464271fbwy6.pdfIn PDF document text
    • http://latuha.com/asus_p9x79_pro_uefi_biospku5x.pdfIn PDF document text
    • http://fitnesspack.net/menu_ideas_for_dinner_party_of_4o6kai.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a947514-b4f3-4b94-8fa9-3f4c10d52a79/xegefezexatoxitaxuma.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/johannesburg_beth_din_kashrut_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81ca14a6-a295-4fba-8250-2c7ba92be0f5/bejelimegaxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9b3600d-5798-4d6c-b076-a32edbe6e568/best_app_to_learn_klingon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34d7558b-3d6c-4a82-9b46-d2796ba9b6aa/zevebubipofokapexumomeni.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/9377101599.pdfIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/luis_medina_pea_invencion_del_sistema_politico_mexicano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fa4c854-1143-4748-8df9-f39daba7517b/51544892034.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/snes_game_genie_codes.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B99 3312 bytes
SHA-256: 19fe6d3511270ee3ff4fbce704f5f4a9fb9182a4344e37e40a38d55828b07e20
font_01_sfnt_off0001177a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177A 4680 bytes
SHA-256: f5b2132ae2e82823ad493ece13ed5e9d90f928b90a287cdd6aecdeba21e60fd9
font_02_sfnt_off00012758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12758 16092 bytes
SHA-256: df881b4bee3fbca98fcbed3480ac8e9d5bb39e89d5a205cf1aa19ddb92fa6bc4
font_03_sfnt_off000159da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159DA 16684 bytes
SHA-256: 4fb18f2f8d176c0c9ddf893a3a69c6eaaaf8ae8309617b6e07033971a2ed751b