Malicious PDF — malware analysis report

Static analysis result for SHA-256 3da18486c72d9b82…

MALICIOUS

PDF

77.1 KB Created: 2021-03-17 08:24:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2ce52659246dec85c235a1e4f2c97ab1 SHA-1: 5b8c1b0512f263b091318f8030aaf89b11820a54 SHA-256: 3da18486c72d9b82862b835b1f32f3ccdeb9071ee710298a9b09d288d05b5ebe
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://vilenefex.ru/strik?utm_term=free+excel+budget+spreadsheet+uk PDF link annotation
    • https://jijemelagif.weebly.com/uploads/1/3/4/0/134016961/3905195.pdfIn PDF document text
    • http://mesanezedid.mypressonline.com/mcqs_on_aldehydes_and_ketones.pdfIn PDF document text
    • http://migasoloraluxuj.scienceontheweb.net/bwv_1060_d_minor.pdfIn PDF document text
    • http://gojavodevagajuw.mygamesonline.org/democratic_leadership_style_in_nursing.pdfIn PDF document text
    • http://stonersfranchise.com/73516932443at7p7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403808/normal_60234fe0aec3b.pdfIn PDF document text
    • http://cccckkkkkdd.space/kuduzasoptoekz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477137/normal_5fe9479e1a3de.pdfIn PDF document text
    • http://lg-copyright.com/install_adblock_for_chrome_androidjwgsi.pdfIn PDF document text
    • https://xexigajusotojuz.weebly.com/uploads/1/3/1/6/131606060/nipivatikiwu_rofikizuxeru_jipun.pdfIn PDF document text
    • http://velesvoyage.ru/ti_84_plus_ce_programs_physics8z6c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379959/normal_5ff42cc91fce5.pdfIn PDF document text
    • https://dinijituwit.weebly.com/uploads/1/3/1/6/131606252/8957512.pdfIn PDF document text
    • http://nokilibetajew.mywebcommunity.org/48829488046.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/panasonic_aw-_he40_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/gazojimugekorisabixub.pdfIn PDF document text
    • http://gozenabuzixi.onlinewebshop.net/kinder_morgan_co2_company_houston.pdfIn PDF document text
    • http://tisavan.onlinewebshop.net/algebra_and_trigonometry_10th_edition.pdfIn PDF document text
    • http://tobikinos.onlinewebshop.net/pdf_file_internal_structure.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/95178374180.pdfIn PDF document text
    • http://tizeruxabono.onlinewebshop.net/remington_870_express_tactical_28_inch_barrel.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_off0000ee8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8B 5564 bytes
SHA-256: 61ada23c2461e409e0dc5d0c8a4ca2c810b652f437995eea59a8eb41bab985e9
font_01_sfnt_off0001016e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016E 11036 bytes
SHA-256: 1bf892ea0bdb43f74b4e0c8b4ce10e9d2fefc598fec85829779f3d102a942113

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