Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e5ad49afa9641ab…

MALICIOUS

PDF

87.9 KB Created: 2021-09-22 09:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6764fdb8cecf8e8006d26417c0970c94 SHA-1: cd947c25dd7cf1a63e8b138b2ea0504003994501 SHA-256: 2e5ad49afa9641ab7f435eeafe30f3acccb3fb5b9bb25110e263c265d1d7ed9f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://crewmak.ru/uplcv?utm_term=mad+out+2+game PDF link annotation
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/gulegonaleweni.pdfIn PDF document text
    • https://foulardfotografando.it/file/fofixisuxojuju.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/2144440896.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16140f386beb1d---65810567478.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/xipulasilamobosan.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/ag4d2vto3isk9qu5lnhv94e9kf/rigaxexeberevez.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/duzufaruxabifeseti.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/72612487326.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/mepebagod.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/vipewusukuresimukagow.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/gaxidizudeju.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/65389717483.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/32053020554.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/tediromadutinowifu.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/popumojakoxifolus.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/93315686697.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/79282458479.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/63322125892.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/99122356289.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/fabikujuvat.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/dokunesopapadiwor.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/deboruj.pdfIn PDF document text
    • http://hitmet.slektenkaas.com/bilder/file/66070065587.pdfIn PDF document text
    • http://torgoborud.org/images/file/kagidinojuvuweriluburo.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/metifipitijigewajilesep.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/52842206216.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_off0000e490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE490 16120 bytes
SHA-256: d97d65bfc46714a487c3764c75de386c7765c3f0a9470d91f0d5c7b23b427820
font_01_sfnt_off00010d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12571 17332 bytes
SHA-256: 27dc92ecd39f728fe197e670201a4c5b38eb435125dd9c0a1600b0b2713fab29