Malicious PDF — malware analysis report

Static analysis result for SHA-256 74a957627837f70b…

MALICIOUS

PDF

75.8 KB Created: 2021-03-24 07:58:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 065318f92282bbfb57bf5669b3c03f0e SHA-1: 2677238c13bc193a8a4b2e8c5959af8c35f008cc SHA-256: 74a957627837f70b5389ad7a03f23692bc1222453cd41f48f94de1868ddc38f0
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to host phishing content. The document body, though heavily obfuscated, contains keywords related to a free Arduino course, likely a lure to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://dugedepap.ru/award?keyword=free+arduino+course+pdf PDF link annotation
    • http://kobodesuwid.getenjoyment.net/pitelivonopulu.pdfIn PDF document text
    • https://dagigofeno.weebly.com/uploads/1/3/4/8/134887245/6edecc9b72b54.pdfIn PDF document text
    • http://xanusojuruxu.sportsontheweb.net/81184162150.pdfIn PDF document text
    • https://vemujevamari.weebly.com/uploads/1/3/1/4/131452814/5801913.pdfIn PDF document text
    • http://tanubujurutemut.scienceontheweb.net/knee_exercises_aaos.pdfIn PDF document text
    • http://resipowepo.getenjoyment.net/types_of_validity_in_assessment.pdfIn PDF document text
    • https://sibitolifi.weebly.com/uploads/1/3/4/7/134732274/40d9173.pdfIn PDF document text
    • https://zeraxoxuret.weebly.com/uploads/1/3/4/6/134642117/mazogi-dafij-nunazikobeteto.pdfIn PDF document text
    • http://dorutote.scienceontheweb.net/nerusafozitakalazenemej.pdfIn PDF document text
    • http://gejudoxe.mypressonline.com/powerful_intercessory_prayer_requests.pdfIn PDF document text
    • https://jizexukufi.weebly.com/uploads/1/3/4/1/134109318/juxovetuduxama.pdfIn PDF document text
    • https://cdn.sqhk.co/liminekaj/fd7Dnj9/80998649864.pdfIn PDF document text
    • http://ladijon.iblogger.org/arduino_projects_for_dummies.pdfIn PDF document text
    • https://detaxotipag.weebly.com/uploads/1/3/4/7/134730838/7a707ad33e46dd.pdfIn PDF document text
    • https://wulapoledonuker.weebly.com/uploads/1/3/2/6/132695240/vofun.pdfIn PDF document text
    • https://zavowije.weebly.com/uploads/1/3/2/6/132680855/muvujobaxaduv_bofabazalixegu_vogowodiroka_mimeger.pdfIn PDF document text
    • https://cdn.sqhk.co/xusarukave/ghgfWZb/4816113025.pdfIn PDF document text
    • https://kibolimu.weebly.com/uploads/1/3/4/8/134872751/7738333.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kedokonox.rf.gd/chinese_culture_information.pdfIn PDF document text
    • http://lejiletuvasipib.onlinewebshop.net/batoxuziwo.pdfIn PDF document text
    • http://buzezozamedat.rf.gd/28188935852.pdfIn PDF document text
    • http://jafixomedimun.onlinewebshop.net/86243885456.pdfIn PDF document text
    • http://dugerem.atwebpages.com/ficha_biopsicosocial.pdfIn PDF document text
    • http://vubelifijam.atwebpages.com/23775038541.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_off0000e9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D8 5072 bytes
SHA-256: 5b07901ffaf8b5131b1f0bb1fd6e95dd1c79f4005cbe2090985bba830547117b
font_01_sfnt_off0000fb2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2B 11528 bytes
SHA-256: d4edd6a958e27153bafd52ce72820f123b0a6eff2ce9bcd81f8d14bb59ab3593

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