Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9e04f3ecd003f83…

MALICIOUS

PDF

79.5 KB Created: 2021-04-14 08:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e10c20a05218715a91c589c494e103a9 SHA-1: 7015ed0d027e1772537b15b4380dae0863006dd7 SHA-256: b9e04f3ecd003f83b75e5120b6ee133af5efb8f2f175ed384f9d097f45857583
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 0.9991

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://kuzutuzo.ru/strik?utm_term=the+origin+of+the+work+of+art+sparknotes PDF link annotation
    • http://arthromedro.xyz/what_is_another_word_for_family_problemsiw89f.pdfIn PDF document text
    • http://mibotirekusiw.mywebcommunity.org/7385217891.pdfIn PDF document text
    • https://gagejewepaji.weebly.com/uploads/1/3/4/4/134444149/7478652.pdfIn PDF document text
    • https://junuwuka.weebly.com/uploads/1/3/4/4/134479395/bdc2e169.pdfIn PDF document text
    • http://prostotit.site/vanivaseligibiy6xok.pdfIn PDF document text
    • https://xavujome.weebly.com/uploads/1/3/0/7/130739328/rijerodevibavebaxa.pdfIn PDF document text
    • http://artelamp.store/how_much_does_noah_make_in_the_notebookfstaf.pdfIn PDF document text
    • https://sikewebuki.weebly.com/uploads/1/3/4/3/134387003/7726179.pdfIn PDF document text
    • http://vivuvulefova.iblogger.org/kendo_ui_editor_template.pdfIn PDF document text
    • http://bawazofo.getenjoyment.net/vubititerijubut.pdfIn PDF document text
    • http://zixonolugajona.iblogger.org/44654064712.pdfIn PDF document text
    • https://cdn.sqhk.co/dawadetugas/hhcwAhe/race_car_crash_compilation_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/kagixepo/4o5jidg/amsterdam_smart_citizens_lab.pdfIn PDF document text
    • http://jenewazajasazu.getenjoyment.net/bp_reference_standard_catalogue_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/tufiroxova/aI5jiY8/wamemexaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dakafatuvuguviz.atwebpages.com/40473791257.pdfIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/beneath_form_a_sentence.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/xomesalaragoka.pdfIn PDF document text
    • https://s3.amazonaws.com/taturi/saxon_math_course_1_cumulative_test_6a.pdfIn PDF document text
    • http://wirirarosutuki.epizy.com/32052418390.pdfIn PDF document text
    • http://tuguwobafadurot.rf.gd/bitsat_previous_year_papers_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/55285257007.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/2008_kubota_rtv_1100_parts_manual.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE349 5236 bytes
SHA-256: 048076fbf3876deea4872ab57860ccbef90e0aa40f62fddd1730fe59d7037bc0
font_01_sfnt_off0000f530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF530 11256 bytes
SHA-256: 4bdc191b7df1848a0ea2561c3be1524ec2f284031b476c603e1e6c91e09ca717
font_02_sfnt_off00011b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6D 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90

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