Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4f11b36ae859fbe…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 19:19:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 50b069078db25d7afb68007cd7fdd674 SHA-1: 01f3e18e001f7a84b5b9670d1a86f6e300da42db SHA-256: d4f11b36ae859fbe28fd3c5ee850ebc2b58115bad574126df78ca192a1a54f60
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

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 https://nomylo.ru/uplcv?utm_term=get+cash+in+8+ball+pool PDF link annotation
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/sigewonurupekusod.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/lanuluvapizumixet.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/japetinadiwikazuzapi.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/vafovetadavota.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25227150354.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/rivekapuwamexakurugagus.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/97486909665.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/43145100552.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/96956513218.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/179109179761392bbe8fc9d.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/14400005048.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/lefovewojulojupuwami.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/goretaso.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/videtuzevalelenas.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/44411030706.pdfIn PDF document text
    • https://serka.com/serka/upload/files/jaresawozemugesop.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/bimirutafidimidawejeb.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/32289795092.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/nixivugogube.pdfIn PDF document text
    • http://china-miyaco.com/img/file/20219211252.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/98181701191.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/4835171146.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/gepakitopefop.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_off0000dd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD26 16696 bytes
SHA-256: b68481bafe0f618c175a94878965cc016b411cbf3c9037952d04c78fb3f29d29
font_01_sfnt_off0001083d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083D 10760 bytes
SHA-256: 0fe93ae1e554122ad3305fd81804f8f8b5532835cc240b6eef0c1ce9edc6fe39
font_02_sfnt_off000120b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1