Malicious PDF — malware analysis report

Static analysis result for SHA-256 35d68e9413235205…

MALICIOUS

PDF

82.8 KB Created: 2021-03-06 19:00:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 37f8b0cb8518cbc3831f66117d9d4014 SHA-1: cb4490e237e40ef305447752d7b7a6682f7a37e0 SHA-256: 35d68e9413235205946bdf02394a41be9e082c3fe2dcbab0b7626c66eef0261e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model also indicated maliciousness with high confidence. The document contains numerous links, many pointing to disposable domains, and one prominent URL that appears to be a lure for search engine traffic. While no scripts were extracted, the presence of multiple external URIs and the phishing heuristic strongly suggest an attempt to redirect the user to a malicious site, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://zajinet.ru/strik?utm_term=what+is+the+best+recumbent+bike+on+the+market PDF link annotation
    • http://xobezised.iblogger.org/fotojet_for_pc.pdfIn PDF document text
    • http://romomikas.22web.org/how_to_download_wii_games_2020.pdfIn PDF document text
    • https://budazibidoware.weebly.com/uploads/1/3/5/3/135386773/dajunivulafibug.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393641/normal_60072338e2971.pdfIn PDF document text
    • https://vesedosaripiwuj.weebly.com/uploads/1/3/1/6/131636692/63d532.pdfIn PDF document text
    • http://poposiruta.mywebcommunity.org/8108487413.pdfIn PDF document text
    • http://pakirekugep.scienceontheweb.net/672953465.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476416/normal_5fd9b338471f0.pdfIn PDF document text
    • https://nutevozugunejeb.weebly.com/uploads/1/3/1/4/131483143/dabep-gololu-fefozilodela-fimowepov.pdfIn PDF document text
    • http://katipef.medianewsonline.com/33751426198.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bufijonewufo.onlinewebshop.net/high_frequency_word_list_spanish.pdfIn PDF document text
    • https://84bd2c60-91d0-47b6-9565-6ae8a6593e58.filesusr.com/ugd/963627_febe6d07972c4ea893319f62592072c5.pdf?index=trueIn PDF document text
    • http://gulavutimomoxu.rf.gd/35762589183.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/91436983062.pdfIn PDF document text
    • http://kedisijusa.onlinewebshop.net/56087255376.pdfIn PDF document text
    • http://lumuwejonalar.epizy.com/loleximotopusilano.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/85214552701.pdfIn PDF document text
    • http://fumesowira.epizy.com/95016503430.pdfIn PDF document text
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_ec210a4b4004481181ba86f5a586fbb8.pdf?index=trueIn PDF document text
    • https://0a497e50-07dd-462d-832d-d8678f741a8e.filesusr.com/ugd/5f857b_9914c5dfde97458b92357c92a07fa406.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/negasuwub.pdfIn PDF document text
    • https://4d75d3c9-3a4d-4df6-84ab-e48b83d723e5.filesusr.com/ugd/cdb50c_8ccbd610cf644c9995a2a04a7100afcd.pdf?index=trueIn 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_off0001075e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075E 5224 bytes
SHA-256: e8868a553e14b8f2a379faefb5f48fc4aec8ff2037285fd4b920cebc20e4db7e
font_01_sfnt_off00011905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11905 10700 bytes
SHA-256: 3a216a373e4359123922dbab1f4a1e866c295e96b870543be36a1c315a2c96fb

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