Malicious PDF — malware analysis report

Static analysis result for SHA-256 4553eea506f02ac2…

MALICIOUS

PDF

92.3 KB Created: 2021-03-05 04:49:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4763b2365cf52299528e221aa3cd9b25 SHA-1: 499f2ee3c8160472ec03905cb7c1d6712a07368e SHA-256: 4553eea506f02ac29b15088a62edf83ae63b7e583eb182c55a8a0d940686c4c9
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to PDF files hosted on suspicious domains, indicative of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. Although no scripts were explicitly extracted, the presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/123?utm_term=shrek+children%2527s+book
    • http://renijulemigato.iblogger.org/kazipedunuk.pdf
    • http://ecoservice-vlad.ru/duxejukagige6evux.pdf
    • http://dapurixid.sportsontheweb.net/98271035935.pdf
    • http://trycabinets.xyz/5508092051344bt.pdf
    • https://cdn.sqhk.co/pedidagow/ieHdNN3/dijovuxa.pdf
    • https://rixorololexapi.weebly.com/uploads/1/3/1/8/131857390/vowivavub_zepubujikidaz_tupurane_nudugatugafa.pdf
    • https://wivixape.weebly.com/uploads/1/3/4/8/134897282/juriwitelasu.pdf
    • https://cdn.sqhk.co/nowavutu/ifWb3jd/34_85__2018.pdf
    • http://xrootunited.com/46746612419m452s.pdf
    • https://cdn.sqhk.co/wikaraxixi/uiaifOJ/mobile_png_for_youtube.pdf
    • http://oyuncuxx.com/xbox_live_account_recovery_formmlx3y.pdf
    • https://cdn.sqhk.co/vafodagusun/Xijidji/free_full_movies_websites.pdf
    • https://cdn.sqhk.co/kerosumumato/g2Fhiex/wibizo.pdf
    • https://lekusimije.weebly.com/uploads/1/3/1/3/131383821/fojakilo.pdf
    • https://cdn.sqhk.co/pomorezolo/bhdnIjj/ac_dc_greatest_hits_2_cd_set.pdf
    • https://wufirojotuxo.weebly.com/uploads/1/3/1/3/131398242/fokabe-bodugukiwe-luwibuzovajazez.pdf
    • https://cdn.sqhk.co/giwumazusew/ahbhbhh/goxatazeve.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://fojoxolizono.rf.gd/wupovozitorijawinenog.pdf
    • http://jawuguv.epizy.com/zemana_antimalware_portable_free.pdf
    • http://zupitatip.atwebpages.com/what_is_a_warden_in_jail.pdf
    • http://dojovosis.rf.gd/big_time_rush_boyfriend.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e6a.bin
e5f28eea6f5bd8c583eb1d8687fa03eeed269a2c5730c8329b55127882e0f4a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6A 4868 bytes
font_01_sfnt_off00012ed0.bin
a812a5a19ada5582bdfc1456cfafed9cf8791f698eeb042e0e396f41e1f7c26b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED0 11500 bytes
font_02_sfnt_off000155d3.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x155D3 4324 bytes

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