Malicious PDF — malware analysis report

Static analysis result for SHA-256 c43e4b9550199b2b…

MALICIOUS

PDF

69.7 KB Created: 2020-11-14 07:43:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 00d4595d714329415503bdfcc406af66 SHA-1: d964ca82f127b67b6eefb6edf1e55123e21878f4 SHA-256: c43e4b9550199b2bdbdf4a0aad32efa865a2ca34c2c3b1828f9a69f72e14a20b
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://traffking.ru/123?utm_term=andis+hair+dryer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370063/normal_5f885dcd9f58c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368468/normal_5f96c0495e37f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407313/normal_5fa7f993cfd2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387806/normal_5faab766afb20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372105/normal_5f89bce6b6429.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421048/normal_5f9a4aa96b6fb.pdfIn PDF document text
    • https://mokitigek.weebly.com/uploads/1/3/1/6/131606839/f72e1e3e52a.pdfIn PDF document text
    • https://vepezifu.weebly.com/uploads/1/3/4/2/134265798/segipadozazu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393751/normal_5f98ed92b0247.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393026/normal_5f9742d547d65.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/likerajatob/proving_lines_parallel_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91e362da-9f66-463d-8375-d93ae9bfe54f/50133866458.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/ipod_touch_costco_price.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/sobipulelugoninar.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_off0000d308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD308 4972 bytes
SHA-256: 00f4ee95a263b4b1ac4b9179154309864e739704750a40816dbfb0f7260910b7
font_01_sfnt_off0000e3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EA 11336 bytes
SHA-256: 4ae1e1a8987c8b950fc36f83e57c242e95680a7b7a22d222f2e7abc70dee52fa

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