Malicious PDF — malware analysis report

Static analysis result for SHA-256 11bc4fa609343c8b…

MALICIOUS

PDF

70.2 KB Created: 2021-04-01 17:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9e4580c5e0dfbb185b2f199bc25a3ef3 SHA-1: ed186756fcaadf599cb50a14f28bdf160e0deaba SHA-256: 11bc4fa609343c8be630ca70ed149ffb872bc9c91674519ba1d3f0224dc8cef4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting services, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to exploit users through deceptive content.

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://soxebez.ru/strik?utm_term=native+american+culture+worksheets+pdf PDF link annotation
    • https://cdn.sqhk.co/xubewarow/jg4yi7X/zemufutijufu.pdfIn PDF document text
    • https://cdn.sqhk.co/nodujugebi/e3Cgeie/hard_boiled_egg_calories_without_yolk.pdfIn PDF document text
    • https://nilesezijifata.weebly.com/uploads/1/3/4/8/134885493/6140593.pdfIn PDF document text
    • https://cdn.sqhk.co/vekotevudoze/IzLggid/gatewabolixel.pdfIn PDF document text
    • http://lezofifividex.scienceontheweb.net/sujokudesajapedimapo.pdfIn PDF document text
    • https://pirodiditabun.weebly.com/uploads/1/3/0/9/130969169/vepade.pdfIn PDF document text
    • https://cdn.sqhk.co/zozijawutuxu/jfNgfii/boat_speedometer_repair_kit.pdfIn PDF document text
    • http://pefiworawodud.mypressonline.com/java_programming_tutorial_using_netbeans.pdfIn PDF document text
    • https://cdn.sqhk.co/butuxolevu/jUiggdU/flying_gorilla_drink_mexico.pdfIn PDF document text
    • http://fovikoxesaweziz.medianewsonline.com/fonabuvofibajaxa.pdfIn PDF document text
    • http://jasazotinalol.mygamesonline.org/79939412435.pdfIn PDF document text
    • https://lotekovikerux.weebly.com/uploads/1/3/1/3/131398560/kelikelejaduforepav.pdfIn PDF document text
    • https://cdn.sqhk.co/dinigivo/3igieen/25527705868.pdfIn PDF document text
    • https://cdn.sqhk.co/pofoxubo/Jsgc5X1/recharge_infosys_smart_card_online.pdfIn PDF document text
    • https://pezulotum.weebly.com/uploads/1/3/1/4/131483557/mewaxezepajuzez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gagolabirej.atwebpages.com/daxipufem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48e35a84-4122-4e38-aa1a-0505b10e91f6/56047344931.pdfIn PDF document text
    • http://sugamane.onlinewebshop.net/career_options_after_10th_class.pdfIn PDF document text
    • http://jagomizaf.atwebpages.com/age_of_empires_2_no_cd_crack_2.0a.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ee313e8-12dd-44f9-b57a-67ac9a59c505/nevatuvamuxa.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_off0000d508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD508 5580 bytes
SHA-256: e8c6e4ef99e34266e3b4ad404e090ff4de397d7c1c1428702b974434f816173b
font_01_sfnt_off0000e7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F6 9856 bytes
SHA-256: bcb09efd85f479a4cd94f499c410d267f35a91fd0fea3bf679197e39f30dec1a

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