Malicious PDF — malware analysis report

Static analysis result for SHA-256 b83926836c8cdc7a…

MALICIOUS

PDF

86.8 KB Created: 2020-11-10 21:07:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 111aec1b1cdaf2f8d1e8bdb9945a0970 SHA-1: 9c8de232c4f89633883155b96dd0e5dfe9861633 SHA-256: b83926836c8cdc7aafcb5b3d521cff80bba2e3f0afcc172473c07831b907157a
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 0.9998

Heuristics 6

  • 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.
  • 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://traffking.ru/123?keyword=3.3.5+fire+mage+pvp+guide PDF link annotation
    • https://mokitigek.weebly.com/uploads/1/3/1/6/131606839/0992aa39a37363.pdfIn PDF document text
    • https://fufajogaxofamu.weebly.com/uploads/1/3/4/6/134627879/xupafunorojapa-maxuguguwil.pdfIn PDF document text
    • https://zolegezuboz.weebly.com/uploads/1/3/4/4/134462972/gugubofon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372382/normal_5f90e176775ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423427/normal_5f9b091c66793.pdfIn PDF document text
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/b086b4293.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458137/normal_5fa35c5cc67e5.pdfIn PDF document text
    • https://kolajinetam.weebly.com/uploads/1/3/4/5/134584148/negimowafo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387586/normal_5f8f408fac924.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/ravusijanefefapit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457272/normal_5fa42f5be4553.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/e6516e14-1de9-4918-8957-07306e4b7003/59454173791.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1702f2e4-5200-4ff4-aace-e8cb54713ad9/70345551576.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31770444-4a12-4171-b365-3497d0dfba53/sound_and_light_waves_crossword_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/32157323986.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_off0001136a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136A 5436 bytes
SHA-256: 4772eb0d2ff7c09c360c479e06d927874ed80b40b1ce910396dc211b07496683
font_01_sfnt_off000125e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E8 11404 bytes
SHA-256: 5456bf490a21ee24604ec859a4cf5ef1075e1777a15fb563337f830d51947795

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