Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c46078a679de002…

MALICIOUS

PDF

78.0 KB Created: 2020-11-18 14:46:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 2be30e28eafc0e2d23f564b4455875c0 SHA-1: 6e691b7d6053a9a1cc10184be74a5466bbcff303 SHA-256: 6c46078a679de002b42988b719ded31a33ec1241dc3cef3723d2b3160308419a
186 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 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffnew.ru/strik?utm_term=common+cloud+types+worksheet+answers PDF link annotation
    • https://sebupemisopuba.weebly.com/uploads/1/3/4/7/134706320/8108447.pdfIn PDF document text
    • https://nometoxuf.weebly.com/uploads/1/3/4/2/134266561/e5a99c.pdfIn PDF document text
    • https://kimegawukinoge.weebly.com/uploads/1/3/4/6/134601577/9031206.pdfIn PDF document text
    • https://pikowezapuxo.weebly.com/uploads/1/3/2/6/132681044/a7f15.pdfIn PDF document text
    • https://kotidirexi.weebly.com/uploads/1/3/4/3/134358756/ef416a0cd7e66.pdfIn PDF document text
    • https://kosemarenile.weebly.com/uploads/1/3/4/3/134315061/ruzikiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393624/normal_5f99ef6a9bf3a.pdfIn PDF document text
    • http://education.armIn 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/90a84db1-c2f5-4485-9943-3df2c2925879/15081232338.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f44eedc-3d2a-4ad4-9ba4-ef55046ad7a0/84854417929.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e7c4b0d-276d-43df-87f2-ce1939dd56f7/ashley_furniture_homestores_outlet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4cbc22d-c72a-4628-a2e6-2310d9c50b30/ser_vs_estar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5057acc0-f3cd-4a05-a6c3-62cbbb28b8f7/gaziwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e3841dd-d24c-43cc-9b04-ee21e7d6537c/exiled_kingdoms_cheats_for_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcc953ae-7f9a-40a4-8415-743bd4bde268/digestive_system_worksheet_answer_key.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_off0000f36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36B 5476 bytes
SHA-256: 0e07b2ca679f4b0bca65a53c49b7ca0e88726042ed9b7683d6abf03423f92bbf
font_01_sfnt_off000105f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F3 10912 bytes
SHA-256: b5343ff55ac102643002ae42360a2f0ea36ad7d4fb8624d87ee60f8d2a44e6c5

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