Malicious PDF — malware analysis report

Static analysis result for SHA-256 73302c20922dda2c…

MALICIOUS

PDF

66.9 KB Created: 2020-11-23 13:02:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 6f9e9a85fd0e0f6c483ae026c1ffb3f6 SHA-1: 6c079246c849348b9bdad57908fdf2b3238f3c60 SHA-256: 73302c20922dda2c75a35d9040db36c7d86164a3b017646102b21169d75a45ff
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://trafftec.ru/123?utm_term=sample+volunteer+handbook+uk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490722/normal_5fbb259b00095.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366004/normal_5f87036b1eef4.pdfIn PDF document text
    • https://fogoravirekan.weebly.com/uploads/1/3/4/3/134335139/devevokuluwu_dasibejow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375509/normal_5fa5a80705126.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384037/normal_5f988569c1d1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413126/normal_5f9e99150839e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415052/normal_5f9e82a8e1c07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392193/normal_5fa38d9a256cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378857/normal_5f9ef8593c3d6.pdfIn PDF document text
    • https://poxobavu.weebly.com/uploads/1/3/1/4/131453713/kurasunoduta.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366055/normal_5fbb25fa604ad.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/59134ea4-3057-4a6b-9484-ef73dd247230/zodefefure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/790b4d8f-a08a-4e89-9aab-452da29e3aad/lifoforowabidisudas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24d617a5-a34c-41d6-babd-4fd8160e5ece/lobijobegulopanivarate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d474b6bf-e6b0-4e69-887a-1406ce91960b/gabevabarojireximu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aabf83be-2069-401c-8e47-edb319a0fa2c/glencoe_biology_worksheet_answers.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_off0000c9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B2 5388 bytes
SHA-256: 3fa30406d0478319a58704ea2e68e26cff6d3205f347783d4544f9c960369906
font_01_sfnt_off0000dbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD7 10216 bytes
SHA-256: 4a93093b8dc942401fc8cff42e9a4f094018178729096a64e3ad31d722dca08d

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