Malicious PDF — malware analysis report

Static analysis result for SHA-256 83b4679a8fb165c8…

MALICIOUS

PDF

84.6 KB Created: 2021-02-26 21:41:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 9b48570cb84282f5fc434bede340383e SHA-1: 04828fc15300235725150763b645a08690e2f40d SHA-256: 83b4679a8fb165c8111be4e46b0047f0c7d024cc7422583d079db7296e4f058b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with a high concentration on disposable hosting and link farm patterns, strongly indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/strik?utm_term=asp.net+mvc+dropdownlistfor+viewbag PDF link annotation
    • https://todijedesat.weebly.com/uploads/1/3/4/7/134775475/tawirasulosu-dogubogugur-nezenoboram.pdfIn PDF document text
    • http://opensalle.xyz/38512080503g8j1l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489404/normal_5fd1a38f4eabe.pdfIn PDF document text
    • https://gupufema.weebly.com/uploads/1/3/4/4/134456882/9765462.pdfIn PDF document text
    • http://levantemosaic.com/wugosexomefebaliwon0bn1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464707/normal_5fc8afd652ae4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448740/normal_601a873ccccca.pdfIn PDF document text
    • https://xitapazutirubej.weebly.com/uploads/1/3/4/8/134882608/6016454.pdfIn PDF document text
    • http://tvoeobrazovanie.fun/mojozitomosakywall.pdfIn PDF document text
    • http://hookup154.site/76642293435o4vz1.pdfIn PDF document text
    • http://nubolutlion.xyz/89260452883kxb0r.pdfIn PDF document text
    • http://toguvuveleguna.22web.org/pimune.pdfIn PDF document text
    • http://dompodklyuch.com/surah_yasin_sharifdhne1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385634/normal_603276a75c974.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sitesiku.rf.gd/english_grammar_punctuation_worksheets_for_grade_3.pdfIn PDF document text
    • http://donafilozevore.rf.gd/bomibajuf.pdfIn PDF document text
    • http://duvexarido.epizy.com/jijesatilakunovegezowom.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00012036.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12036 21524 bytes
SHA-256: 029fa0af3d6ed26222931eb8acd20d30a8ef5d704203daba2ac72e4a2fe74249
font_00_sfnt_off0000e52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52C 5788 bytes
SHA-256: 6170ea338b1038416a6a3eb77505b892373a10a03cf8d8e89fb645f9b6bc8704
font_01_sfnt_off0000f8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EA 12196 bytes
SHA-256: 8588364564f84f8cc3e57557bc8cbaafb4bb726c51c445a6fda7a96bc61973a9

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