Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57d96e062e5a262…

MALICIOUS

PDF

77.0 KB Created: 2021-03-20 18:11:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8e99876ec5c39bc0b4977a7eb2824156 SHA-1: e1fc44a1a77072bb9ecf8855c19ebf403aaaa125 SHA-256: a57d96e062e5a26243ae456eb007d119a322d7b9eaeb8a93050af4b8171c4ba7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jottigo.ru/strik?utm_term=6+times+table+worksheet+free PDF link annotation
    • https://cdn.sqhk.co/solalokazili/ibiVvV2/vaxigapawekuxagepezufevi.pdfIn PDF document text
    • http://gosoxegekiri.mywebcommunity.org/pain_catastrophizing_scale_form.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481156/normal_5fc7f7443f7b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467007/normal_5fd3422381362.pdfIn PDF document text
    • https://cdn.sqhk.co/kawiwitifa/c0iahbP/qatar_stars_league_table_oddsportal.pdfIn PDF document text
    • https://cdn.sqhk.co/jexerigix/Pgh9iia/alternative_to_google_maps_api_android.pdfIn PDF document text
    • https://cdn.sqhk.co/feguzuvubut/cLibggA/limexizul.pdfIn PDF document text
    • http://zokidinodajives.getenjoyment.net/aquaponics_systems.pdfIn PDF document text
    • http://podifodosej.scienceontheweb.net/murray_lawn_mower_bagger.pdfIn PDF document text
    • http://gifinibufenatar.medianewsonline.com/dosutisokudetejix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365620/normal_60001137c3f4a.pdfIn PDF document text
    • https://cdn.sqhk.co/kubabulukod/fm4xsHa/66327609907.pdfIn PDF document text
    • http://ganedoxumizaj.sportsontheweb.net/33923575553.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416923/normal_602d49059df9f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485578/normal_5fc8ff009efed.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/donake/tagewow.pdfIn PDF document text
    • http://lamupimifuban.onlinewebshop.net/adobe_premiere_rush_free_transitions.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/how_to_write_korean_letters_a-z.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/23441834337.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1c11517-3c0b-4064-9512-b3af75adadee/wazexajosarotekexedul.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/rumelagodegal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf5d2ad1-ac55-4283-9f6f-b1a034f81b22/the_veldt_ray_bradbury_test.pdfIn PDF document text
    • http://jokajejuti.atwebpages.com/govamajezebez.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/bokujibinasojakozixebig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd2a3815-0a41-4506-bc4f-33c25c7b53f3/duriguni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ec225f1-fe28-4f74-ac95-e13eef495397/is_diary_of_a_wimpy_kid_going_to_end.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86d57ae8-21da-4dca-af43-2297301c1081/kali_linux_programs_on_ubuntu.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_off0000f0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BC 5364 bytes
SHA-256: 219772b8a06a1dfbfa5bfc73ad142fa31e47c6e6b6d6c51d4b17a5f4a13096b9
font_01_sfnt_off000102db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DB 10356 bytes
SHA-256: 8a20797f02904bd73536df3656bdab4eb9f0825ed985aff54c950b2349bfa4cb