Malicious PDF — malware analysis report

Static analysis result for SHA-256 997d664c906caba7…

MALICIOUS

PDF

99.5 KB Created: 2020-11-10 07:59:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 446bd8de725d63cd888954b8aff888c7 SHA-1: 9db679eb83ecf2b1558b46f0806342c31cdc1b93 SHA-256: 997d664c906caba745135e0ca2e9ad32018dd1cb7cc93c2fc420954c1dbcb614
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 0.9998

Heuristics 5

  • 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.
  • 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://trafffi.ru/aws?keyword=codependency+for+dummies+free+pdf PDF link annotation
    • https://tenabawik.weebly.com/uploads/1/3/2/7/132710661/9165533.pdfIn PDF document text
    • https://toxoladosa.weebly.com/uploads/1/3/4/4/134479392/bezibije.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://uploads.strikinglycdn.com/files/f72b8fdc-04b0-4a3e-803b-ac04b17e6d0c/xelirerorenilisetev.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/49783509804.pdfIn PDF document text
    • https://s3.amazonaws.com/bubisifapagefe/quadratic_equation_calculator_from_table.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/jordan_driving_school_registration_form.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/arnaud_desjardins.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91e2537c-dddb-457a-8cbd-42d5946ae8c4/rocket_league_animated_decals.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bd561ce-a4a5-4099-8cbb-dcb5d7d71fd5/73544468275.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/dopadorujimurasaja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45c0e551-c7c8-42e1-8d61-799ffe374980/toredagerojatumo.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/sams_carnegie_mellon.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/76505299835.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2414420-638d-4dd5-a429-016e7308cd73/lerowezurowepupifu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac4d5f03-b2e4-43f8-9cd8-999c550f0ece/jesataxokosumanefebipikux.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_off00013f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F21 4988 bytes
SHA-256: 6eba436751a5ed10ee91972b144ba5d6b031355fd6d31579feb65c9ee8b66482
font_01_sfnt_off00015001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15001 10180 bytes
SHA-256: 5c0b73e2cc734f1a782abfa6dc7e694ffc710aac14595df1ccda20b75237e85d
font_02_sfnt_off000172e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172E9 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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