Malicious PDF — malware analysis report

Static analysis result for SHA-256 739c445df7ee22a4…

MALICIOUS

PDF

75.9 KB Created: 2021-03-04 23:53:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 6935ed98a30346448ce3cd70ebdfa9e4 SHA-1: 92f6f9efbcb45b68b7e9c7712c1f664c679cc2c6 SHA-256: 739c445df7ee22a4ea5e474b88c37fe6967edb3fcd6ee549315ed065d1b0b7c6
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one pointing to a domain associated with link farming and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/wix?keyword=cub+cadet+sc500z+manual PDF link annotation
    • http://purejup.iblogger.org/what_is_the_role_of_a_site_warden.pdfIn PDF document text
    • http://lomizagin.iblogger.org/line_6_spider_v_120_mkii_120w_1x12.pdfIn PDF document text
    • http://dimax-matrasy.ru/suxitorenigetojapanimump7ju3.pdfIn PDF document text
    • http://wellwork.site/pictures_of_world_war_ii_bomber_plane453no.pdfIn PDF document text
    • https://cdn.sqhk.co/gepabafi/yjbjfJI/debaruxaninopu.pdfIn PDF document text
    • https://cdn.sqhk.co/lirebirab/gjjjfhe/7746630036.pdfIn PDF document text
    • http://tryplafond.xyz/73686397911kt0cn.pdfIn PDF document text
    • https://cdn.sqhk.co/nojedajoze/4xgeick/aaa_phone_number_ma.pdfIn PDF document text
    • http://xuwivezotuw.22web.org/90820955160.pdfIn PDF document text
    • http://vadonodip.22web.org/sta_rite_well_pumps_near_me.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/05123dc9-b31a-4471-b87f-4dd335800435/15557004497.pdfIn PDF document text
    • http://jimanujomubil.epizy.com/android_get_wifi_password_no_root.pdfIn PDF document text
    • http://petikagemejol.rf.gd/81909801831.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69fe9b39-581a-4695-8ae7-54183ca81f5b/taco_bell_soft_taco_no_cheese_nutrition.pdfIn PDF document text
    • http://gagelenobom.epizy.com/basic_english_grammar_test_free.pdfIn PDF document text
    • http://xewegifugeralot.rf.gd/bajrangi_song_pagalworld.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c1552f0-bca4-46c9-ad8d-538fdc96c80f/mazudejakizategabidazum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82d83756-ec50-426b-b727-6fce0aec233f/50_shades_darker_full_movie_download_300mb.pdfIn PDF document text
    • http://kitasiru.epizy.com/jojezezinidigod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/306d0081-c07c-456c-b03a-83af5496f789/kofosob.pdfIn PDF document text
    • http://vukenorap.epizy.com/wakovubolipubasemanexejej.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_off0000ed46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED46 5348 bytes
SHA-256: 369ec7fba65c97a015d9258c4d1609da69fc4e475bced06acf7ea4b5b174f6f9
font_01_sfnt_off0000ff66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF66 10372 bytes
SHA-256: 898f01e33e49774f2e3302a8071a227fd67573d6455bf209f39698a47f184beb

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