Malicious PDF — malware analysis report

Static analysis result for SHA-256 65f699834af4f37d…

MALICIOUS

PDF

73.3 KB Created: 2021-03-09 12:45:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: b6dfd93fb204a7b3116924831cc80be7 SHA-1: 7b38f1800e873fc75179a65d086eba3212ead9f9 SHA-256: 65f699834af4f37df66831b0c973c40878bf8bcfd010f99e764e53fe9006db09
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many of which point to disposable domains or link farms, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to host many links on potentially untrusted hosting. While no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/award?keyword=nespresso+capsule+guide+pdf+2020 PDF link annotation
    • http://wigarijagebufuk.iblogger.org/webafileposij.pdfIn PDF document text
    • https://cdn.sqhk.co/kimefutif/iaRgdgc/murakinusuzonawazibomo.pdfIn PDF document text
    • http://juwaniwabi.medianewsonline.com/how_to_connect_epson_xp-310_to_laptop.pdfIn PDF document text
    • http://fusegufuw.iblogger.org/20463946299.pdfIn PDF document text
    • http://merokomazojewi.scienceontheweb.net/que_es_un_agente_de_ventas_y_sus_funciones.pdfIn PDF document text
    • http://ravovenovibu.medianewsonline.com/samsung_rf268abrs_ice_maker.pdfIn PDF document text
    • http://nepoxiduvilej.scienceontheweb.net/lorex_eco4_960h_software_download.pdfIn PDF document text
    • http://zesenadozefut.sportsontheweb.net/universal_remote_chunghop_rm-101_codes.pdfIn PDF document text
    • https://cdn.sqhk.co/sexasegavon/a2fifby/62042798180.pdfIn PDF document text
    • http://nadipewin.mywebcommunity.org/lowrance_hds_5_gen_1_power_cable.pdfIn PDF document text
    • http://pimifawimonidij.mywebcommunity.org/age_of_exploration_vocabulary_worksheet_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://580b68e3-2104-4118-ae5b-4f285de1c062.filesusr.com/ugd/dad7b5_e67e206cacae4d709ec477b000ad9e8d.pdf?index=trueIn PDF document text
    • http://nokejufesuw.atwebpages.com/diary_of_a_wimpy_kid_old_school_free.pdfIn PDF document text
    • http://dugubokig.rf.gd/jatoluviraxarigibanami.pdfIn PDF document text
    • https://933527c5-e005-4225-a3aa-05fee46c7696.filesusr.com/ugd/b51dd5_58a995e34de142b19bbfed402e961842.pdf?index=trueIn PDF document text
    • http://zepizevut.atwebpages.com/wixisurefuwoli.pdfIn PDF document text
    • http://rusoguwobanuga.rf.gd/agenesia_testicular.pdfIn PDF document text
    • http://niwurekatexo.atwebpages.com/52557283016.pdfIn PDF document text
    • http://musovulazapa.epizy.com/68713546060.pdfIn PDF document text
    • https://d54d55f4-8004-4613-9f19-7b96cbed0ae7.filesusr.com/ugd/ce4b32_2d6d5312611f4214aaf295777da98a31.pdf?index=trueIn 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_off0000e1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BC 5564 bytes
SHA-256: 24c1a6e97e323ffaff117b0dfa3fa003a00ab37fa1eaab9da1194b9d021eabee
font_01_sfnt_off0000f4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C1 10304 bytes
SHA-256: 5c6f2fbd7eb4827a85380fac17965c88643ae79249311c203046e34046ff596e

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