Malicious PDF — malware analysis report

Static analysis result for SHA-256 773bdc591a66fa06…

MALICIOUS

PDF

79.3 KB Created: 2021-04-09 12:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 595362165771a2d8083cd1871c740aa5 SHA-1: 91e82d5a9d29969083f949377dba0a88e2a2a973 SHA-256: 773bdc591a66fa06a475de80edaecdc81e66da441281bb0594949802653ccf40
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 0.9996

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://midufefew.ru/strik?utm_term=public+speaking+anxiety+classes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4478926/normal_605f0d383a302.pdfIn PDF document text
    • https://cdn.sqhk.co/nivavepe/iVNhjrj/birds_of_prey_2_release_date.pdfIn PDF document text
    • http://fukuzowi.sportsontheweb.net/gemokofevuwitekonexafabi.pdfIn PDF document text
    • http://mokuduvejevuz.scienceontheweb.net/automotive_service_repair_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495531/normal_60542673d7f91.pdfIn PDF document text
    • http://gasomenuza.iblogger.org/nifukivosukaroval.pdfIn PDF document text
    • https://cdn.sqhk.co/ramidazumiko/bCihihY/survival_simulator_mod_apk_happymod.pdfIn PDF document text
    • https://nagipunewemog.weebly.com/uploads/1/3/5/3/135315215/weluvabada.pdfIn PDF document text
    • https://surarapumo.weebly.com/uploads/1/3/4/3/134305151/41100fa02.pdfIn PDF document text
    • http://ladekepevij.mygamesonline.org/94213407240.pdfIn PDF document text
    • https://cdn.sqhk.co/metusoteliza/ji4jggc/16864193395.pdfIn PDF document text
    • http://zipubezexupoka.mywebcommunity.org/rewamosomedafolijegoku.pdfIn PDF document text
    • https://cdn.sqhk.co/xefijumu/jklwifn/aivatar_animated_sticker_whatsapp_wastickerapps.pdfIn PDF document text
    • https://tunilawogipafex.weebly.com/uploads/1/3/2/8/132814387/2f872174fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470207/normal_5fe149ab46832.pdfIn PDF document text
    • https://nuresoxak.weebly.com/uploads/1/3/1/3/131380504/degolilidelexogevut.pdfIn PDF document text
    • https://rafinavogeseb.weebly.com/uploads/1/3/5/9/135987446/jabipi_waruligawesoxe.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/2f8a93eb-f117-4e7e-97b9-686ededdcd3d/76386364965.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de64e4ed-895f-45ca-acb4-3c3e6a48d7b1/stock_for_dummies.pdfIn PDF document text
    • http://rugeritubaduw.epizy.com/roxibub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecfadaf5-3d7e-4bb8-98c7-52649206d9ea/90728284638.pdfIn PDF document text
    • http://zutadefado.epizy.com/bailey_and_love_new_edition.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_off0000f81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81E 5380 bytes
SHA-256: 97b830866810a69a9489155bb72327013bb6f09382cdc225d3cc90f2e4cc8a71
font_01_sfnt_off00010a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A89 11012 bytes
SHA-256: 17ff029a6ad12aecefec318bfa9c62b3d035ecfdb0cc2424511a9dda09e83510

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