Malicious PDF — malware analysis report

Static analysis result for SHA-256 595877ce0e5ccb72…

MALICIOUS

PDF

82.0 KB Created: 2021-03-06 09:51:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 6a61f0da2fd1a26f2203a26ef119b557 SHA-1: 8e5c3edce666ee34379ca8f60014b59991f495d6 SHA-256: 595877ce0e5ccb7282f391084590169e4c830d4f9a9d41698d22b548749add8c
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, directing to various PDF documents on different domains. This behavior is indicative of SEO manipulation or a distribution mechanism for potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://leonvi.ru/award?keyword=can+exercise+reduce+iron+levels PDF link annotation
    • http://gemobaraza.iblogger.org/nepezufe.pdfIn PDF document text
    • http://zarozunaxa.iblogger.org/channels_tv_apk.pdfIn PDF document text
    • https://lifoluzasodani.weebly.com/uploads/1/3/1/4/131437418/rabomajadavo-levim-remogor-fowotovi.pdfIn PDF document text
    • https://cdn.sqhk.co/butiluluvuk/jONnia6/souzasim_moped_edition_apk_mod.pdfIn PDF document text
    • https://lamuwopinu.weebly.com/uploads/1/3/4/6/134632291/mager_gizoxafoxadaxi_boweso_ginamimu.pdfIn PDF document text
    • https://zovipimisog.weebly.com/uploads/1/3/1/1/131163747/pefuzanefivujer.pdfIn PDF document text
    • https://xikefopu.weebly.com/uploads/1/3/4/7/134748362/307973.pdfIn PDF document text
    • https://cdn.sqhk.co/widiroje/AF0hfTH/phone_ringtone_download_apple.pdfIn PDF document text
    • https://cdn.sqhk.co/lijipatalenu/uwheeij/wordscapes_level_8589.pdfIn PDF document text
    • https://lixazasowab.weebly.com/uploads/1/3/4/5/134588429/86dd64afef9.pdfIn PDF document text
    • https://cdn.sqhk.co/mujetujojen/jbjgs2O/shopdisney_uk_castle_collection.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zawemitop.epizy.com/baby_names_meaning_god_answers_prayers.pdfIn PDF document text
    • http://mapawobesatamo.rf.gd/excel_spreadsheet_basic.pdfIn PDF document text
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_035da731bfca41008b3234af10da87e9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dupula/novixo.pdfIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/british_dressage_prelim_2_test_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/cilex_logbook_sheet.pdfIn PDF document text
    • http://sonazawokog.rf.gd/muzammil_al_kahfi_1-_10.pdfIn PDF document text
    • http://sedabil.epizy.com/84088991785.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/30200275212.pdfIn PDF document text
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_7040392f15e8415198f5616006152433.pdf?index=trueIn PDF document text
    • https://9f9bd9fa-00fe-4673-b34e-9a629881f524.filesusr.com/ugd/09273f_1343e329ec7f42819ca435468b54d591.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gumagabu/statistics_class_10_worksheet.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_off00010599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10599 4964 bytes
SHA-256: 39c968a4763ef33baeb16a2a9191b416cb93500a3f48373a8a36a3ecd7b04692
font_01_sfnt_off0001168a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168A 10612 bytes
SHA-256: e3cd33f37108662b2d540bf527d4e5b8596f7293fb3e249744997fc95dce83be