Malicious PDF — malware analysis report

Static analysis result for SHA-256 3875ddbfaaea4998…

MALICIOUS

PDF

75.2 KB Created: 2020-11-25 15:54:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 416d679e60afcb7bced48ebe7a264141 SHA-1: 156627e0a58c60d4a03cf32269c361c2b7113e7c SHA-256: 3875ddbfaaea4998880059abc653b1b650363f38d55974eb895ca4835b9b7807
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://trafffe.ru/strik?utm_term=six+guns+cheats+android+download PDF link annotation
    • https://tamatopufav.weebly.com/uploads/1/3/4/3/134386909/vefenevilujo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418584/normal_5f9f45a679f2f.pdfIn PDF document text
    • https://varipejat.weebly.com/uploads/1/3/0/7/130739080/pedukaloxutulamoji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369760/normal_5f967187bbddb.pdfIn PDF document text
    • https://pazolumaf.weebly.com/uploads/1/3/4/3/134356568/golabosabusazujogube.pdfIn PDF document text
    • https://rabidibizuzej.weebly.com/uploads/1/3/4/6/134648686/6060759.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375708/normal_5f9c4d831b535.pdfIn PDF document text
    • https://zopugazuf.weebly.com/uploads/1/3/4/6/134658021/6123242.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467298/normal_5fb9e6c090ec3.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/ef74e45f-71db-47e8-bea3-2e35509b33cf/6854552131.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/42435337781.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3f470b0-41a3-4df7-992a-6d887c0c2914/ttnet_mzik_mp3_indir.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/princeville_il_high_school_website.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_off0000d226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD226 5464 bytes
SHA-256: cfc6fa351f16595ea681c73498b4ad35dd426f9e6707f0b51d916d888ac68355
font_01_sfnt_off0000e4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D3 10896 bytes
SHA-256: 6d2e8135ddaf4c2d54282a70b7685d5e782361d9cdf1b012c5bd07ab247e46cd
font_02_sfnt_off00010a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A37 16272 bytes
SHA-256: 79a8b90f55ff6552f604b654de9415a285e7315ac61835edf8590ffdbde93965

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