Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfef90286a2c886d…

MALICIOUS

PDF

67.5 KB Created: 2020-12-10 11:52:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e7f9b4822084be5209f1aebd8527b386 SHA-1: db09fee18d678a733f1eff408e3220075c93217b SHA-256: dfef90286a2c886d8c52718cba9b766e5f6bb39185c32ba8a8f83dec1135c826
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://trafftec.ru/wb?keyword=gravity%20falls%20theme%20song%20violin%20sheet PDF link annotation
    • https://dotanivim.weebly.com/uploads/1/3/4/7/134705276/65bfd37802.pdfIn PDF document text
    • https://moxolodoxezem.weebly.com/uploads/1/3/4/6/134678964/382493b89dd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kesumasaka/honors_chemistry_worksheets_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/upper_extremity_arterial_ultrasound_worksheet.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc18963085bf90c0e0195e8/t/5fcd3d1874a40730fba51a91/1607286040681/zifomiso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08d15466-fc42-4567-bf13-427bd348330e/androide_almas_infinitas_mortal_komb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17fe71b8-d1db-4eb1-920d-a9f6103b03d1/231951807.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e53d576-c28c-4927-b966-35d257b222ea/lucky_star_bus_cafe.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5bb8cb3e0f577146d359/1606376377065/mafia_2_cheats_pc_god_mode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cb34489-036c-40ec-b2b0-1d88ae59e593/mint_jelly_recipe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b6d61d4-0839-4b7e-8fd0-3c1c4ae79e97/prconisation_peugeot_courroie_distr.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/conditional_lien_release_form_texas.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bbbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBBD 5164 bytes
SHA-256: e7c60a423ca21f881607809890b679e73d0b897589049a4364a977b47dd80f2d
font_01_sfnt_off0000cd34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD34 11136 bytes
SHA-256: dbd97980d9f8d1faf73f492c81804fc419937cfe0b47a46670e54e5d2f444f6c
font_02_sfnt_off0000f2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F4 4324 bytes
SHA-256: 8405bb6ca9a6fb718a2e910e1cdde4d74ac2122cab0061dc5f772322db9c7ccd

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