Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e5d8818358dfd3…

MALICIOUS

PDF

72.7 KB Created: 2021-05-10 21:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5cbd130c21e5e58e7204ebea425631fe SHA-1: 83a6f0967a086f5ca51c94e2d3154be0f77b14c9 SHA-256: 71e5d8818358dfd31a326363983631ee3d0f78e258a67dc436b583d18fbb6d11
126 Risk Score

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-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://leonvi.ru/strik?utm_term=all+american+canner+915 PDF link annotation
    • http://jonipifenukiz.mygamesonline.org/the_caucasian_chalk_circle_themes.pdfIn PDF document text
    • http://mojenisijita.mywebcommunity.org/proyecto_alumbrado_publico_led.pdfIn PDF document text
    • https://retenosarubus.weebly.com/uploads/1/3/2/6/132695405/sezurizutige.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/gabefagezegunamikigujoz.pdfIn PDF document text
    • http://karma-911.com/7.3_transmission_swaptvrfk.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/chixhjx/41364066240.pdfIn PDF document text
    • http://itravelgr.com/wurozotezakixuzl63z5.pdfIn PDF document text
    • https://mobugozuko.weebly.com/uploads/1/3/4/8/134869294/3c4dd0.pdfIn PDF document text
    • http://milanomodaitaly.site/benopusesipabupu7drg8.pdfIn PDF document text
    • https://cdn.sqhk.co/xamizine/sjhjh4g/apple_store_apk_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/xumelesep/jcngchg/pizopasanavugizuteg.pdfIn PDF document text
    • http://itprod.space/daleretifokeduxv9kql.pdfIn PDF document text
    • http://copyrightsupporthelpcenter.com/restaurant_costing_sheet3dtx1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vegonuwulaki.epizy.com/zojarefakoz.pdfIn PDF document text
    • http://zuwodiruvukima.epizy.com/agile_software_development_with_scrum_download.pdfIn PDF document text
    • http://kinugokapa.rf.gd/wondershare_filmora_effects_free.pdfIn PDF document text
    • http://sofikej.rf.gd/12794058957.pdfIn PDF document text
    • http://laratimokusewa.rf.gd/mitubikapoxijowibalet.pdfIn PDF document text
    • http://sulorunak.rf.gd/felemuzefitejumutabif.pdfIn PDF document text
    • http://pupekulojam.epizy.com/kogerewufikimimafuwaruk.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_off0000df4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4A 5088 bytes
SHA-256: f2d72b9ac46a8af962384e3a5796f9af17bb2e6a275315d3487afd91e4ed5a75
font_01_sfnt_off0000f089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF089 11088 bytes
SHA-256: 0e613485732289428b396619544b6daaf1c6fe705b7ad0d7096946d4bd580f76

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