Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf8ab2d06e904998…

MALICIOUS

PDF

83.0 KB Created: 2021-06-12 19:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0f10c59b2241066fad684657794925d5 SHA-1: 2da0234b0b77f6715a1290832dc0852c1739384a SHA-256: cf8ab2d06e904998b99ce15a270c84e1a4eec1a68a4030bcc7458a9eddce29d2
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://infrive.ru/pbw?utm_term=word+scramble+solutions+free PDF link annotation
    • https://zobatovegu.weebly.com/uploads/1/3/0/8/130873738/zufuvufawidibo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420597/normal_606e7e100f7b6.pdfIn PDF document text
    • https://fuzurisef.weebly.com/uploads/1/3/4/3/134369427/daxozujabawilu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372101/normal_5ff4196e145bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458150/normal_5fd11d6338b92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447903/normal_60bd42844619b.pdfIn PDF document text
    • https://xuganozixebiwu.weebly.com/uploads/1/3/4/3/134311953/62b67d4bd52.pdfIn PDF document text
    • https://tagenomamoz.weebly.com/uploads/1/3/4/4/134476715/2167670.pdfIn PDF document text
    • https://rowisinudusa.weebly.com/uploads/1/3/5/3/135310113/gewaxajaga-gadaxezijus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471996/normal_602155d76d2b9.pdfIn PDF document text
    • https://givodopularolot.weebly.com/uploads/1/3/7/5/137508410/46bbfadf368fde.pdfIn PDF document text
    • https://dadanesikukuno.weebly.com/uploads/1/3/1/4/131438481/xolibivaxares.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454182/normal_5fd8bd0e49510.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403808/normal_606733ec320cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421966/normal_5ffb3cc35849e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lakobun.pbworks.com/w/file/fetch/144663432/daridarozokuzilidaxi.pdfIn PDF document text
    • http://lokiboz.pbworks.com/f/mopunumujovamupak.pdfIn PDF document text
    • http://xetibubib.pbworks.com/f/coloring_book_of_shadows_witch_life.pdfIn PDF document text
    • http://wefolevemud.pbworks.com/w/file/fetch/144475299/what_is_artificial_intelligence_in_ai.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_off0001060e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060E 5320 bytes
SHA-256: aa147a7ba4183b142afa4bd666f12c3754892c8b571392d8e62090e88b1a87e3
font_01_sfnt_off0001181b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181B 11404 bytes
SHA-256: 25b50df8d1a399558247de220bd0bcf3855e41a5071ded4a4e702cafad95c510

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