Malicious PDF — malware analysis report

Static analysis result for SHA-256 f743203f720ed2ce…

MALICIOUS

PDF

103.0 KB Created: 2020-11-11 21:18:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d5249447b13bbfdfddaa21707b02a5c7 SHA-1: dbea40f362bb1d53cddec3600ebc5dd69e2661d1 SHA-256: f743203f720ed2ce01d8e8385005cd0fe151cbbaed4aa4b686a0a46b98ae8c45
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-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://traffine.ru/123?utm_term=v+for+vendetta+summary+and+analysis PDF link annotation
    • https://gabumisuxenumu.weebly.com/uploads/1/3/4/3/134366459/7648221.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480149/normal_5fa8b7298be8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381090/normal_5f8d04582ce0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371010/normal_5fa33bb10e666.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387565/normal_5f8d9e0cbbeb8.pdfIn PDF document text
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/vawunasaripula_dukitini_kitoguf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365536/normal_5f980dd8a78ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376374/normal_5f98131831d7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413475/normal_5fa695be9a685.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/187601b1-527a-4976-b540-e2a98f129111/kilin.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/solidworks_exercises_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/15428457013.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/ddo_character_planner_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79cfae33-1523-42a0-8619-4e1cce78eb89/html_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/hanukkah_worksheets_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001346c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1346C 5180 bytes
SHA-256: f33d5e727aaf248d260e8e8249bbb80fdc4ae890c783e6e647173972f1923103
font_01_sfnt_off00014609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14609 11744 bytes
SHA-256: edbd9ada7e6e85d2df67269069e343f1714d5c4ae88a0466c905ad0a9cd9a366
font_02_sfnt_off00016d37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D37 20048 bytes
SHA-256: e8ef3599fd8e82af442abe37c0a66f217fdbb2b6f9b2748c9af63abb107ce7e3

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