Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3cff913ca911808…

MALICIOUS

PDF

78.0 KB Created: 2021-03-24 13:04:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9e25b8ea9f4cf8dc9030b0076ef772d3 SHA-1: 5121c9f125a6b72f6f2d8c478c12b5f29cebfa6f SHA-256: b3cff913ca91180812876f0fbfff860fccdb06a450a33f382ba34fae24be6fe6
186 Risk Score

Malware Insights

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

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 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://pelibifir.ru/award?keyword=vedic+astrology+basics+for+beginners+pdf PDF link annotation
    • https://cdn.sqhk.co/wojidumezu/ciihaOk/77084073912.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefima/ggphjSl/cannon_shooter_game.pdfIn PDF document text
    • http://rejorevubirobu.sportsontheweb.net/48638739138.pdfIn PDF document text
    • http://zusazibob.iblogger.org/what_were_the_czars_of_russia.pdfIn PDF document text
    • http://nupokupukog.22web.org/23198265159.pdfIn PDF document text
    • https://cdn.sqhk.co/xolanikipiz/ghjftjh/8685888664.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/idjgiiw/scary_horror_escape_walkthrough_level_1.pdfIn PDF document text
    • http://neletaparufo.scienceontheweb.net/xolefeguwogolajubekimogaw.pdfIn PDF document text
    • https://cdn.sqhk.co/goberirud/ihbwdhf/jurassic_survival_island_dinosaurs_and_craft_android_1.pdfIn PDF document text
    • http://wisevajiliji.22web.org/tepanuwi.pdfIn PDF document text
    • http://fexevewuli.mypressonline.com/pentair_sta-rite_pool_pump_manual.pdfIn PDF document text
    • http://sutiwejepeb.22web.org/autodidacte_scurit_informatique.pdfIn PDF document text
    • http://fizebiredasibi.mypressonline.com/wuruxuriwilipobexepozagun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://849bdae7-2456-4570-9e2a-fc769e7e49ad.filesusr.com/ugd/2074c9_006543d5ebfb4f7b84fb84725fad91e4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/bulajedudewoxorofogivos.pdfIn PDF document text
    • http://wegizadix.rf.gd/enteral_nutrition_clinical_practice_guidelines.pdfIn PDF document text
    • https://6e678f60-abc6-404c-883a-cd1729fdffee.filesusr.com/ugd/e4291f_e28f6aede692484bae309191bf827070.pdf?index=trueIn PDF document text
    • http://zasagugidi.epizy.com/totinupixamolama.pdfIn PDF document text
    • http://vivirimivu.epizy.com/46072747087.pdfIn PDF document text
    • https://s3.amazonaws.com/wizomoravazub/vudesapobupimugumal.pdfIn PDF document text
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_6a468ce90f3f41a5802ce9d35468a71a.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_off0000e9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EB 5528 bytes
SHA-256: dd5b6b0bddd64874a141d6d73554f09f4cde5b7a9654b23bcac3b4140a4588b7
font_01_sfnt_off0000fccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCC 14324 bytes
SHA-256: 29ccec1f0d674d5508e4559764afff18ed5dcbf6c72c57e5411660addeee4b9e

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