Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf232e84be3d559b…

MALICIOUS

PDF

76.7 KB Created: 2021-09-14 04:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 81d7e372ace81c49e7fffbe3b0d41276 SHA-1: ed49252b2f7b1bbe6bc3e64a878de64af882eb52 SHA-256: bf232e84be3d559bde0f2229657cf8aa01dcd529c5f22db78aefabb744ff566e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that redirect to a link farm, ultimately attempting to lure the user to download a GPS emulator. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and URL analysis point to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://drafthe.ru/uplcv?utm_term=gps+emulator+download PDF link annotation
    • http://jatechkj.pl/upload/fck/file/bijofegutomaten.pdfIn PDF document text
    • http://megalaserasia.com/upload///90310400695.pdfIn PDF document text
    • https://istanajp2.com/contents/files/wejidofujuvajajere.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/sasuwamalapexomowid.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/pobikagim.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/tizozogexodokopubokagesof.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/zujanarevebulinobave.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/56920821868.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613758365147f---gomitamonupabivugukex.pdfIn PDF document text
    • https://umartravel.com/files/4229111447.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/91743085577.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/41926011310.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/310292491.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/sotadokadoparuvipame.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/lozaluvaxe.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/valijuxadirezinogukok.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/nepifeberodolatuwax.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/1996256422.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/23353565862.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210904031812.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/kekadajimatoxig.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/59887743793.pdfIn PDF document text
    • http://slsnn.ru/content/files/8764915948.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_off0000c1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D8 19432 bytes
SHA-256: ba08d9109c36f71fd86597d32a3aa798a59efff4305b4b72d758e65b7c645d7e
font_01_sfnt_off0000f48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA1 10688 bytes
SHA-256: 957a19d5a308897a94c90fc309b11f351573dc396f5f381c0f0099ca6a6ebcda