Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cab8bcbc982fc4f…

MALICIOUS

PDF

80.0 KB Created: 2021-02-18 04:50:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 840d96677bc0c52ee3576b919c6bcf8d SHA-1: a59a1d0fa8a4d2e3c5a7eaa0a722565fc637522b SHA-256: 9cab8bcbc982fc4fecf212af6cdffeef52c961e0f469e9eefeddbfcbdab32045
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate an attempt to deliver a payload or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://seumenha.ru/aws?utm_term=nespresso+aeroccino+stopped+frothing PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495058/normal_60283c93293e3.pdfIn PDF document text
    • https://saniruguroxi.weebly.com/uploads/1/3/4/5/134585545/kexobirabenex.pdfIn PDF document text
    • http://vvinorama.fun/programacion_orientada_a_objetos_jav2y9q6.pdfIn PDF document text
    • http://nibelv.xyz/342068783760jewt.pdfIn PDF document text
    • https://zowotojezef.weebly.com/uploads/1/3/4/3/134330732/zimituduxolunames.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401691/normal_6006314957da5.pdfIn PDF document text
    • https://cdn.sqhk.co/sodelaranu/bnTihgg/74339558666.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420907/normal_6009070893717.pdfIn PDF document text
    • https://nonemofolovexuv.weebly.com/uploads/1/3/0/8/130874593/f10f088eb.pdfIn PDF document text
    • https://finukapaxareb.weebly.com/uploads/1/3/4/4/134494590/8892932.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403541/normal_60072a23e3ad6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445119/normal_5fe9f54c891e1.pdfIn PDF document text
    • https://cdn.sqhk.co/tuteremekome/uugfgds/64486949752.pdfIn PDF document text
    • https://cdn.sqhk.co/lebudawojafi/4hedig7/jeweluwaxed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413016/normal_5fd25fb86de3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366397/normal_602bb22b9ab7f.pdfIn PDF document text
    • http://fb-pageunderreview.com/17299371784ax18a.pdfIn PDF document text
    • https://cdn.sqhk.co/suvotoruwot/ijs6ifi/rinaposo.pdfIn PDF document text
    • http://good-production11.site/certificate_blanktus8a.pdfIn PDF document text
    • https://tazabojadikeze.weebly.com/uploads/1/3/4/6/134648043/lijajolowik_fifonaregagiv_poposodopaba_gudekuni.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418985/normal_5fc6d8661bb7b.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/somisilegex/alvida_audio_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/tamil_animation_funny_videos.pdfIn PDF document text
    • https://s3.amazonaws.com/wurivuve/jakazifolenirifizexukow.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/repabet.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_off0000f8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EB 5352 bytes
SHA-256: 95dec8028e6fdf4974a414f7200ce84bcd1c886c55526c7d6658c17d37d2a035
font_01_sfnt_off00010b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B20 11756 bytes
SHA-256: cc1d28bd6307e499313b52bf8477a4c3c84cbed3dd98d6bee27600f473f15140

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