Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4a5b723b9fa5741…

MALICIOUS

PDF

73.1 KB Created: 2021-02-11 01:43:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0b3b8bdfdd5ba1a04f2d9b4c46038840 SHA-1: 4fbb5fa66efac3a21d48f51718ff06007a8cbf64 SHA-256: f4a5b723b9fa574105121237e90b4f5cdda1b995ab1d5ddf9226ab242811b77e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to suspicious domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://druttle.ru/wb?keyword=open%20crystal%20report%20in%20pdf%20c# PDF link annotation
    • https://vuvoxuwamulixa.weebly.com/uploads/1/3/0/7/130739220/xoxusob.pdfIn PDF document text
    • http://gnfcns.info/cypress_report_filee8cvg.pdfIn PDF document text
    • http://furniture21.online/mazonevonizc0b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489028/normal_5fccf395e83ba.pdfIn PDF document text
    • https://dexidexida.weebly.com/uploads/1/3/4/2/134235246/ragixuwu.pdfIn PDF document text
    • https://tanatomunedasov.weebly.com/uploads/1/3/5/3/135325499/fanov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366400/normal_5fce5b739906b.pdfIn PDF document text
    • http://lifeeuro.info/social_matthew_liebermanfyjbn.pdfIn PDF document text
    • http://winclean-shop.space/supplemental_security_income_amountf81nu.pdfIn PDF document text
    • http://want-seo.ru/rozawodafebuze2uu.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/wovugi/85910242729.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/paphiopedilum_species_the_essential_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/gijugebasurawi.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/google_feud_answers_is_it_cool_to.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/26830966698.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/bejeweled_blitz_android_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/angkasa_pura_2_co_id_informasi_karir.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/conjunction_formal_definition.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_off0000e019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE019 5276 bytes
SHA-256: 2854fa07de92f0f73e34eea6920fa3bce6963ddca1ab0e450c24d07d4d1ecbb0
font_01_sfnt_off0000f21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21F 10948 bytes
SHA-256: 4d24a412f95240e27dde1ec8bda289ccb6a6dee45b4ca55be0a4d72ad890625a

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