Malicious PDF — malware analysis report

Static analysis result for SHA-256 231e31a72593721f…

MALICIOUS

PDF

74.0 KB Created: 2021-05-21 17:34:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ae7b85e813d3a6e415525fed8574c71f SHA-1: 8f168d06ce148f28a853c108431c347bfd88a8cb SHA-256: 231e31a72593721fd43da2d1a499d758b6b08d2bd594a6c743a1640bb696c0b6
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds external URLs that direct users to attacker-controlled resources. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/strik?utm_term=m-audio+fast+track+ultra+8r+win+10 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460045/normal_601bfe1848816.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382414/normal_5fd1020f8cb0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379971/normal_605794c97fd3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421783/normal_602ca9abf17a0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2ba12b8-ccaa-4218-a7cb-cc989cd38d20/daradakadekibewamatuxon.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/35610994551.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/bonjour_print_services_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/pizumul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9891d083-1624-415d-a951-f87a18bb2476/garmin_zumo_660_update_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94b713e8-6066-4d69-8fdc-90cc96faaeb0/53353615691.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/momuwut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3da7555-d502-49f3-97fa-2b3b4020fda4/56342859829.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/beethoven_moonlight_sonata_3rd_movement_music_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edb78c39-d168-4eb9-8522-6b8c4d391b15/37168922898.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/reperusimaj.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/tratamiento_psicologico_para_el_bullying.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b71a60a1-3acd-4e2c-9235-e89d76cc47b2/15172467069.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/what_age_should_a_baby_use_a_jumperoo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4076ca11-ff65-42c3-adf4-8b56aed521a1/how_much_revenue_did_frozen_2_make.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/gujedozimajigezevasi.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/7157843759.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/happy_endings_tv_show_characters.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/soxoweritixuvukuposipaje.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_off0000e082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE082 5596 bytes
SHA-256: 150a0337deb48718f7354286ebd9bc186301e577e86640df911dbce028c082d2
font_01_sfnt_off0000f3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D0 11416 bytes
SHA-256: 3644dae3879e330848340e3a5b96b9d9e0329f50664ebbb05be39ae1023992d7

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