Malicious PDF — malware analysis report

Static analysis result for SHA-256 441b19c12f48c59f…

MALICIOUS

PDF

121.2 KB Created: 2021-02-28 10:52:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a46f7e39ac07e186a17c74c98dadc4c8 SHA-1: 9f7aea5b3f526d2b78fc7bbeea2659304fbd14b2 SHA-256: 441b19c12f48c59f829249110f41bdf7aee613f2bd5c10dfc78679c886734148
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://golowaki.ru/123?utm_term=oracle+sql+12c+installation+stuck+at+91 PDF link annotation
    • http://zikewexer.scienceontheweb.net/bedemexekamatesuvaguga.pdfIn PDF document text
    • https://xuvodovujekezoz.weebly.com/uploads/1/3/5/9/135957716/2af4888770e.pdfIn PDF document text
    • https://baxelawinojiw.weebly.com/uploads/1/3/4/3/134333718/31dc2c457e2d9.pdfIn PDF document text
    • https://cdn.sqhk.co/sivadapexiri/jniaBhh/5045330670.pdfIn PDF document text
    • https://verumoxozuvije.weebly.com/uploads/1/3/1/4/131407377/bawidumusetoru.pdfIn PDF document text
    • http://mujabelor.mywebcommunity.org/54523780413.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457560/normal_5fccee1299887.pdfIn PDF document text
    • https://cdn.sqhk.co/gejixoneku/JicZYy0/cake_decorators_around_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446264/normal_6030a64e88a28.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xasovewipeje/19256817967.pdfIn PDF document text
    • http://dowuvoduwitovos.atwebpages.com/budom.pdfIn PDF document text
    • http://kesofater.rf.gd/rexinatabifekiwenidi.pdfIn PDF document text
    • http://virotowil.rf.gd/75832877955.pdfIn PDF document text
    • http://gijenuja.epizy.com/padojolaledurari.pdfIn PDF document text
    • http://zubiluwetij.myartsonline.com/79076405362.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FC0 5232 bytes
SHA-256: 53770d7fe9dd0e04b5746deead2e0abec392f2deb21c3f908b8a45428756915b
font_01_sfnt_off0001a1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1A6 12008 bytes
SHA-256: d366d3efcaf32ced040d3d023c2d6a922a20726de4d0a5ea786145f314011b69
font_02_sfnt_off0001c8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C8EB 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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