Malicious PDF — malware analysis report

Static analysis result for SHA-256 01b45e3d2c14a064…

MALICIOUS

PDF

80.7 KB Created: 2021-09-13 10:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5204fbae751ce396279338d1bffddfc7 SHA-1: 350b1286f85d960bb34e3d2da968e72a9ca4e076 SHA-256: 01b45e3d2c14a06446a1036ccb978882f6100e58dffe07e1d913f4cab931c948
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to potentially malicious domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high likelihood of this document being used to redirect users to malicious sites, possibly for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://pantipplaza.com/userfiles/file/12224403900.pdf In PDF document text
    • http://maezawa-jidousha.com/js/upload/files/ziriturabusad.pdfIn PDF document text
    • https://akconta.com/uploads/files/terixisarigivu.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/14772202173.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/giduxowedirixunisojile.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66815015388.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/tawofakewomafi.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/55871069236.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/59689210692.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/41944013870.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/nofosivegunegijereja.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/bufozano.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/fafejuferanu.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/47916329729.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/49050041832.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/44626784625.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109031030318942.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/65061670479.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0f14c4ae7---xigudufedoz.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/rn0qmk73bkfim81rc7v45iq8f0/86653868781.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/latugobevosexezesad.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/35429796530.pdfIn PDF document text
    • https://phnews.ro/files/file/mojunipovuwerepiful.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/73071529404.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/27142995256.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=android+fling+animationPDF 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_off0000c41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC41F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC36 17216 bytes
SHA-256: c0edd18b4a0dd9304a00e13e9e936897ec45f9261c7b83cd18d1db0e2d52564a
font_02_sfnt_off00010943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10943 16800 bytes
SHA-256: 52b1209f2b4fde4e98c08dcb73d0a35a52d30a8aac030e077820403e8e2ee381