Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bda37dd6ae37160…

MALICIOUS

PDF

78.8 KB Created: 2021-03-31 02:41:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c96f7e60c30ed712a019791204a70e5a SHA-1: 7354678a0ba2bf7b310f9943c3525b3cdaf5d9ed SHA-256: 2bda37dd6ae371602f268ea96b65f0f966ab9459a3c2ee9c5f9ca0f7999c5a2e
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains lures related to invoices and attendance sheets, aiming to trick users into clicking embedded links. Several heuristics indicate this is a link farm on disposable hosting, designed for redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://baarspo.ru/123?utm_term=nios+deled+workshop+attendance+sheet PDF link annotation
    • http://mitedujonajezed.scienceontheweb.net/75057787141.pdfIn PDF document text
    • http://invitesistem.ru/wendys_cheeseburger_nutrition_information0kp8v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381344/normal_5fe75ae9bce2d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419820/normal_5fc5a9fbad767.pdfIn PDF document text
    • https://cdn.sqhk.co/suxepemup/Byhiids/auto_background_remover_software_free_download.pdfIn PDF document text
    • http://topchambre.xyz/nitolazizegenebasegovz6yqv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496597/normal_604cdadc6530b.pdfIn PDF document text
    • https://cdn.sqhk.co/rivitovolu/gjhbign/99277249342.pdfIn PDF document text
    • http://ch-redirect.icu/affidavit_form_nswiom3r.pdfIn PDF document text
    • http://vodabutopidaru.getenjoyment.net/download_excel_2013_free_for_pc.pdfIn PDF document text
    • http://gusevoxuzuwelap.mywebcommunity.org/agamemnon_bangla.pdfIn PDF document text
    • https://cdn.sqhk.co/juvebuzizej/69fYgek/39407225345.pdfIn PDF document text
    • http://ouily.xyz/occupational_stress_scaleqjtbw.pdfIn PDF document text
    • http://iranomics.com/6386783588mtjvu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426572/normal_605969a035e8d.pdfIn PDF document text
    • https://cdn.sqhk.co/risinibigasi/Ojee49D/telugu_private_love_ringtones_download_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370052/normal_5ff1360321dd8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://memepev.myartsonline.com/american_english_phonetic_symbols.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/daily_crossword_clue_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/68584709099.pdfIn PDF document text
    • http://zevesijuduma.atwebpages.com/cathleen_ni_houlihan_yeats.pdfIn PDF document text
    • http://xejobutek.onlinewebshop.net/87419580232.pdfIn PDF document text
    • http://fotizojorirepel.onlinewebshop.net/esp8266_arduino_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/rupefupowupokadunevopabo.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/91267076004.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/blank_map_of_the_world_showing_continents_and_oceans.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_off0000f54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54D 5288 bytes
SHA-256: d9dd25beecc625ed9d7d5b315b22e4f83c6d1278165021c2583f23743ac461c8
font_01_sfnt_off00010753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10753 11172 bytes
SHA-256: 1e17f07d44f0dd346601a0cb528bca5819ff5f92246a6d0939b50fb109cfc949