Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c3113c9aef5b426…

MALICIOUS

PDF

69.4 KB Created: 2021-02-23 13:41:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 35a1ee0b34907401db390b946748b9c0 SHA-1: 2f8bd33f00447d599de9e7c0e382ad76e2afd318 SHA-256: 3c3113c9aef5b426ab46aa103dbcfbf4557f470b9bc713a3ce0141489b30377c
134 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bologen.ru/wb?keyword=heat%20transfer%20book%20by%20gavhane%20pdf%20free%20download PDF link annotation
    • http://zubiki.top/bosch_axxis_washing_machine_not_draining4arnz.pdfIn PDF document text
    • http://leyloften.online/vomepijegopugoloz25byl.pdfIn PDF document text
    • http://vajogeboru.iblogger.org/kukri_size_guide.pdfIn PDF document text
    • https://japapetokanov.weebly.com/uploads/1/3/1/4/131454126/memubusufigajulu.pdfIn PDF document text
    • http://canonsburglake.com/finakuder87ylj.pdfIn PDF document text
    • http://good-production9.site/website_hosting_web_page_templatekr0pu.pdfIn PDF document text
    • http://profaudit32.ru/howls_moving_castle_full_movie_free_englishxlqag.pdfIn PDF document text
    • http://osummer.space/vifelagakiloponokuketipbbhux.pdfIn PDF document text
    • http://negozio50sconto.info/are_wilks_pressure_washers_any_goodz1ple.pdfIn PDF document text
    • http://chategratis.online/1315716693jb00y.pdfIn PDF document text
    • http://terem.space/614776332443ltao.pdfIn PDF document text
    • http://phtech.site/vzxtr.pdfIn PDF document text
    • http://wowuzarupi.iblogger.org/95264124892.pdfIn PDF document text
    • http://arnautmebel.ru/logiciel_schema_tableau_electrique_gratuit_schneiderpnbc5.pdfIn PDF document text
    • http://abwaab.su/428614746655m6h4.pdfIn PDF document text
    • https://jezipupokegem.weebly.com/uploads/1/3/4/0/134042816/dunob.pdfIn PDF document text
    • http://saudiautoinsurance.com/58319900282friv0.pdfIn PDF document text
    • http://prizinsta.info/vivah_film_all_song_mr_jattqtlae.pdfIn PDF document text
    • http://lnstagramverifiedsbadgesforms.com/subaru_ea190v_pressure_washer_parts_diagramr8006.pdfIn PDF document text
    • http://lomigizukifomor.22web.org/performance_self_appraisal_comments_examples.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jozizirepimetel.rf.gd/27593355068.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_off0000c314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC314 5460 bytes
SHA-256: f37ccac633184de5622e18abc645eb21027a91f971e023a009941b30fc29edd8
font_01_sfnt_off0000d5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AE 10556 bytes
SHA-256: fb9a24f67080882e96e3704c03ae74af7811ea6dd5959919f8fdab162afb34a8
font_02_sfnt_off0000f9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DF 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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