Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a1f2e7817fb33d0…

MALICIOUS

PDF

82.6 KB Created: 2021-09-15 14:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1aa9e09a759278212c867154c9894740 SHA-1: 77d032d5232f4f1d2b55f31dac7a7878f28b57ae SHA-256: 9a1f2e7817fb33d0a20d934262d9eecdcd0e05052698a20e6e7174077efc0390
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://archism.ru/uplcv?utm_term=what+is+my+password+for+my+phone PDF link annotation
    • http://www.gieskestukadoors.nl/ckfinder/files/files/ridikulirokexaxorimobor.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/29768806937.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/37677738231.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/89604216497.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/mazezikasatovo.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/simepixiwaxej.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/xexuretek.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/46989935391.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/16188884333.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/wazirasajofazakonujizovul.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614146ab820c4---femupugebidozedituvilusiz.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/95272851842.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/76224136137.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/56480294210.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/1540360704.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/vonoguwirada.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/19618962257.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130839a1551e---waxetorutumolovone.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/39187635199.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109021537246468.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/fodubenigog.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/gatimufixipokus.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/laloravewowirijamoti.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/makebovekafaximi.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/96394251087.pdfIn PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/wezedowarusa.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/xabaralas.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFB 18644 bytes
SHA-256: 20c0ea098929b3f217eea5c767b1151e1c0007a437444001a4dd500689ffc2a7
font_01_sfnt_off00010bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAE 10912 bytes
SHA-256: 7a8d32888114ddfb98003ee704d358265f8a6f8255ada144a782d97bb9560695
font_02_sfnt_off000124d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1