Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d2603ba09e3fbb8…

MALICIOUS

PDF

63.2 KB Created: 2020-11-21 22:33:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 6ac86af5bc3e20d553785d7dab5949c7 SHA-1: cf9f5371fab593288930591429cc6cf94b858f43 SHA-256: 2d2603ba09e3fbb8c8889928c97cb0ef68a2d4acad8caeba47a3ae93c116fffa
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://traffine.ru/123?utm_term=earth+science+lab+manual+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402711/normal_5f986f5600c64.pdfIn PDF document text
    • https://wuvirinofibugiz.weebly.com/uploads/1/3/1/0/131070402/fuziwakirub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379842/normal_5f9177d703f57.pdfIn PDF document text
    • https://saloramorolo.weebly.com/uploads/1/3/4/3/134307331/xufikijevexazisugal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457570/normal_5fa46a2f36891.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368218/normal_5f8cbb746b1ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387562/normal_5fa4e9ddd1522.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448731/normal_5fa42dfa1269a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383450/normal_5f91f6832cc10.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/badodemebo/letter_template_uk_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/bezavaduj.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/dudifalunigomudataw.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/ghost_town_kanye_west_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/kents_mechanical_engineers_handbook.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB37 5228 bytes
SHA-256: f4f8c475c7b1619a8538dd7e788a6b67d8373d5f8fc2b73416e626f0642e5765
font_01_sfnt_off0000ccea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEA 10460 bytes
SHA-256: 50e0762d38c5251d8e5e96bf56567d9ab74c4badcb0e423110562237bb55ab67

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