Malicious PDF — malware analysis report

Static analysis result for SHA-256 3be6312437ae2881…

MALICIOUS

PDF

78.0 KB Created: 2021-04-06 01:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 566a5a0b35627fb0dec027dae1764f08 SHA-1: e6c66fdba1349847a62bec25e64aba17b95ac212 SHA-256: 3be6312437ae2881ec19ee720e6cfeba468d2fe211e008e9982805261eed8eeb
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of external links and the overall structure point towards a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/award?keyword=algebra+ii+workbook+pdf PDF link annotation
    • https://cdn.sqhk.co/tinolefowi/jj2Csxq/zejanowuzefitajolop.pdfIn PDF document text
    • https://cdn.sqhk.co/bafesugoguwi/nNhiNje/stickman_five_nights_survival_2.pdfIn PDF document text
    • https://cdn.sqhk.co/gutejalajige/0ghiHeu/kojekerilepem.pdfIn PDF document text
    • https://cdn.sqhk.co/boguzivipel/s4jn9jg/gonin.pdfIn PDF document text
    • http://nokirixako.iblogger.org/travel_guides_commentator.pdfIn PDF document text
    • https://cdn.sqhk.co/gupetipek/Jid3ghw/bowetutosibezuv.pdfIn PDF document text
    • https://cdn.sqhk.co/zavonufovi/hjjBC7x/wpf_listbox_empty_template.pdfIn PDF document text
    • https://cdn.sqhk.co/jelasusoved/ahgiigh/pinball_arcade_ps4_tables_on_disc.pdfIn PDF document text
    • http://xilibinebosapeg.mywebcommunity.org/2157885219.pdfIn PDF document text
    • https://cdn.sqhk.co/nonofukunumu/GrjcjhQ/rotatasenexuwiraxew.pdfIn PDF document text
    • http://kofodotig.sportsontheweb.net/how_to_complete_certified_mail.pdfIn PDF document text
    • https://cdn.sqhk.co/nawiwola/cgjDhhU/descargar_videofx_music_video_maker_pro.pdfIn PDF document text
    • http://paxijivatebul.getenjoyment.net/isomerism_questions_and_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/demographic_form_meaning_in_urdu.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/penojoxurufukerolozezu.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/sigafuxitolatukinu.pdfIn PDF document text
    • http://ribaxekag.epizy.com/87634561388.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/checkbook_register_template_for_numbers.pdfIn PDF document text
    • https://s3.amazonaws.com/girilifawuxi/60819686817.pdfIn PDF document text
    • http://zutugidod.onlinewebshop.net/11237536774.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_off0000e98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98A 5316 bytes
SHA-256: 50676840a41b0ff23cc3ca15abe7c01ea4fd4aa2ab38f2e7bb049a1a64d543cb
font_01_sfnt_off0000fbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBF 16932 bytes
SHA-256: b43d44a5f053f8f72fe2eb6247bc52fc0dba803a498c2fdd4adb83b5761aac14

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