Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f3cfb46ff0d04be…

MALICIOUS

PDF

82.9 KB Created: 2021-03-14 10:37:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4530c60b38831a0cba6d18f8bcb9fec1 SHA-1: 109d4d3ab5bbf965cc1f04a12aab5c1107908dca SHA-256: 7f3cfb46ff0d04bed3fcfe799cc6042746d98b46964e06eb9e5cccb7118d6110
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 0.9994

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://nipisod.ru/strik?utm_term=best+political+books+of+2020 PDF link annotation
    • https://cdn.sqhk.co/nutewakizi/hezhijc/51164424147.pdfIn PDF document text
    • http://namafafiteg.mypressonline.com/gitex_2020_exhibitor_list.pdfIn PDF document text
    • https://cdn.sqhk.co/lizuloka/lzYrjaF/mk11_klassic_skins_pack.pdfIn PDF document text
    • https://cdn.sqhk.co/vemosoveveb/hgjbD8m/16424890662.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/PahgIAS/milady_chapter_12_review_questions_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/vavusiwi/hahehjH/supezutivanusozufoxo.pdfIn PDF document text
    • http://ipatovaalena.ru/xajokegerotixukcd7dp.pdfIn PDF document text
    • https://cdn.sqhk.co/rotonoba/TdijgcP/67261175513.pdfIn PDF document text
    • http://nigasheff.xyz/battlefield_bad_company_2_aimbot_pcmnk2k.pdfIn PDF document text
    • https://cdn.sqhk.co/vomuvojovi/jcHyWwE/kerbal_space_program_game_ps4.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojelawov/hjHbhgt/suwoxiwewadev.pdfIn PDF document text
    • https://cdn.sqhk.co/gobisofokox/gelEQhj/rixojibif.pdfIn PDF document text
    • https://cdn.sqhk.co/doxurozupu/hfe5uhf/getogufo.pdfIn PDF document text
    • http://letuxegesilem.iblogger.org/dixapuroxevutax.pdfIn PDF document text
    • https://cdn.sqhk.co/bomunerafoju/hbvwigE/brimnes_ikea_wardrobe_review.pdfIn PDF document text
    • https://cdn.sqhk.co/rajosibakulu/eha3ig2/arhaus_catalog_request.pdfIn PDF document text
    • https://cdn.sqhk.co/lepezusija/7aiiSsx/slot_machine_meaning_in_spanish.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xolevusafo.myartsonline.com/business_english_conversation_worksheets.pdfIn PDF document text
    • http://rosevasejila.myartsonline.com/if_there_is_no_rental_agreement_can_you_evict_someone.pdfIn PDF document text
    • http://janenukexozi.epizy.com/cascade_control_definition.pdfIn PDF document text
    • http://dogazuzi.epizy.com/automated_testing_for_android_apps.pdfIn PDF document text
    • http://vozotokunu.rf.gd/9064174250.pdfIn PDF document text
    • http://popofisofol.myartsonline.com/java_technical_lead_interview_questions_and_answers.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_off000107b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B3 5440 bytes
SHA-256: a363c22c3d33bbfb072cd1b50e1969ae4f04eb2b9f4edf867832499c12d04659
font_01_sfnt_off00011a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4D 10760 bytes
SHA-256: 5d7c90a0c22ef6c1b031b235ace895c1802e1dfb75002acd59734d645dda26af

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