Malicious PDF — malware analysis report

Static analysis result for SHA-256 51760cc7304b2f1f…

MALICIOUS

PDF

75.8 KB Created: 2021-03-31 17:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a591fa380314ff654cafbea5b5312f74 SHA-1: e3214fbb2f771737e8259c238e906da7f4e860a3 SHA-256: 51760cc7304b2f1ff7a7b5ce84dd7124543bc41b4eff1b96dd12346b394bacb1
146 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URIs, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam context, further supported by the presence of links to potentially malicious domains. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://botokaw.ru/strik?utm_term=how+to+start+your+own+non+profit+organization+in+texas PDF link annotation
    • https://cdn.sqhk.co/gagowuname/ehigcib/occupational_health_services_definition.pdfIn PDF document text
    • http://waramejejit.22web.org/26990315885.pdfIn PDF document text
    • https://cdn.sqhk.co/fanasuzajem/jagjVhg/dusinalozanagesi.pdfIn PDF document text
    • http://50offit.pro/3380712025165tom.pdfIn PDF document text
    • http://rowejabajusape.22web.org/who_shows_the_most_courage_in_to_kill_a_mockingbird.pdfIn PDF document text
    • http://qrettalq.online/477447072809mvh5.pdfIn PDF document text
    • https://cdn.sqhk.co/kewudomavave/8pjdUaq/drag_bike_racers_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/texirisawoz/xgcjb7p/miui_10_android_9_mi_mix_2.pdfIn PDF document text
    • https://cdn.sqhk.co/xujurovemu/g0jee1V/97221839887.pdfIn PDF document text
    • http://diwejibazetar.iblogger.org/razisovajodipiwuta.pdfIn PDF document text
    • https://cdn.sqhk.co/pagozixupezi/hcuyjb0/gegofetelofi.pdfIn PDF document text
    • https://cdn.sqhk.co/gutinisiv/fiejfgd/f1_manager_pc_mods.pdfIn PDF document text
    • http://detonicinitalia.website/kinematic_equations_worksheet_cstephenmurrayu2jcx.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/sogovekevi/provides_temporary_storage_of_food_enzymes_and_waste_products.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04ff3b72-48e4-4330-b387-0e4a6c832803/inicio_ciclo_escolar_2019_mexico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea1a26c2-a417-4c0e-9bf5-e17ecadbeb4f/what_color_is_your_parachute_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/olevia_tv_wont_turn_on_blue_light.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_off0000ea4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4A 5312 bytes
SHA-256: 9e897a877fbdc8b85e8c75de725dfdc3ec864e32a9c6790b0dafd169e5a397d0
font_01_sfnt_off0000fc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC94 10952 bytes
SHA-256: 4249c60ebfcd26a682e18e657cf1912ec2b0df9a28c924bfb28e267aa01a24ca

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