Malicious PDF — malware analysis report

Static analysis result for SHA-256 b754ef6ae73341ac…

MALICIOUS

PDF

82.3 KB Created: 2021-09-18 05:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5bf83c738c96bc77708f4345ea826bd4 SHA-1: ca58e8f80178f5b2bd26b14479fdcfb25a6d235a SHA-256: b754ef6ae73341ac8f2d21d058a8b37f8dd8e3c3dbcabce2c9ddc0b8387e981e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit PDF reader vulnerabilities or redirect users. The PDF also features a large number of external URIs, many pointing to disposable hosting, suggesting a link farm or phishing attempt. The presence of embedded JavaScript indicates an attempt to execute code, likely for malicious purposes such as downloading further payloads or redirecting to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://anaminfo.com/attachfile/file/xogugowivipeto.pdf In PDF document text
    • http://morakothotel.com/file_media/file_image/file/ragafejasakezugigotisuf.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/49832802522.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/69524777683.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tezifusifadega.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614464bbf32ff---lemugu.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/85358784913.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/kifosatitefogixitopunot.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/wixibikoxisiliwefedejonas.pdfIn PDF document text
    • https://nyig.com/files/file/zevikirupela.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/runawi.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/pewala.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/52183776190.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/fl38k4dnubjgdbnlo4rq6k9ct0/62705420840.pdfIn PDF document text
    • https://rezilta.com/psum/admin/userfiles/file/mirazorer.pdfIn PDF document text
    • http://coumert.com/images/file/75909914243.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/15856542746.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/22827985297.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/vokikeverukuwuvoga.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/vadet.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/520015604.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/36889657645.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/69522178833.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=transferring+messages+from+iphone+to+androidPDF link annotation
    • 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_off0000db86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB86 18144 bytes
SHA-256: b246de2fdd8cd18cbf23573a67572e6b9393032eccba71c3f3e105df1596189c
font_01_sfnt_off00010a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A49 10860 bytes
SHA-256: 025199af76456c11cd285cc8a7f06b69a0d091dce9fe35d3f819d50b3706962f
font_02_sfnt_off000122f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1