Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca3977923383b1b7…

MALICIOUS

PDF

115.3 KB Created: 2021-03-30 09:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 71f8156077abdbd7e16921a33847ea41 SHA-1: 59ae956ed7e32f9aaab473c04855df73b7815977 SHA-256: ca3977923383b1b72a7a69b17ae1916f10f8cc7ae7a343a5ca6922c2460609b7
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 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/wix?keyword=parasite+eve+weapon+guide PDF link annotation
    • http://hisgohar.site/what_is_surface_structure_in_syntaxm6mqd.pdfIn PDF document text
    • http://merokomazojewi.scienceontheweb.net/2020_buell_1125r_service_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/wazafanez/1ru6sjV/nefeligalisobipisowo.pdfIn PDF document text
    • https://cdn.sqhk.co/gexojavo/eODjjhh/free_avery_5160_address_label_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393511/normal_5fec0ba85aa9b.pdfIn PDF document text
    • http://lassituda.online/how_does_cbt_work_for_gad2t3v6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499329/normal_60527febe7743.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450356/normal_5fcd600d92f22.pdfIn PDF document text
    • http://testersairf.xyz/4717761868561ubj.pdfIn PDF document text
    • http://fejekadiwoxobiz.getenjoyment.net/21695993523.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389568/normal_5fe1a64ce9d6c.pdfIn PDF document text
    • https://cdn.sqhk.co/joxusozomilo/3hdibhe/guided_math_conferences_by_laney_sammons.pdfIn PDF document text
    • http://jenerotisa.mywebcommunity.org/76902670902.pdfIn PDF document text
    • http://logvoz.ru/jedomotekofakenaxogazamukybksm.pdfIn PDF document text
    • https://cdn.sqhk.co/zamokaxu/Xgigi9C/vibuveva.pdfIn PDF document text
    • http://armada.technology/adobe_premiere_portable_download6rhbh.pdfIn PDF document text
    • https://cdn.sqhk.co/mugapowejog/eknjaHs/prince_harry_net_worth_2019.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/zosevid/real_bout_fatal_fury_special_apk.pdfIn PDF document text
    • http://bopiguxa.atwebpages.com/gevul.pdfIn PDF document text
    • http://bokawevetejap.atwebpages.com/48495113892.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/zojodojezatidalo.pdfIn PDF document text
    • http://piwakitidi.onlinewebshop.net/73458626168.pdfIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/jimi_hendrix_little_wing_guitar_tab.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/cognitive_behavioural_therapy_books_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/reading_and_writing_exercises_for_beginners.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE2 22712 bytes
SHA-256: d4c6b368c944f9faf5c0b632fb62abac0880a2297c535a319233e243366c62b9
font_01_sfnt_off000184e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184E3 5248 bytes
SHA-256: 79f5b808ef642adc921698d7ede23fbc4e4dba9504c28063ef5484dda2e7d94a
font_02_sfnt_off000196df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196DF 11480 bytes
SHA-256: 2024c28e9cd7b7e5058eef24e627869b388755b4c3993524e04088b50624cdea