Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b93d0df9cac902…

MALICIOUS

PDF

72.0 KB Created: 2021-09-28 06:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eb0e9ce50272cf5015460456c9176aa8 SHA-1: d8da7d630f84bb188230d5bdfaa669c5865616f6 SHA-256: a8b93d0df9cac902575a19883f432c437c70f8718ee994541ae72a48d742109a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, and is flagged by ClamAV as a phishing trojan. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of distinct external links, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the nature of the embedded links and the ML classification strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://milkexim.ru/imgeditor/file/81211894987.pdf In PDF document text
    • http://djapm.com/userfiles/file/21999535995.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/97952126977.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/lamulanalizomixarelov.pdfIn PDF document text
    • http://djapm.com/userfiles/file/17387286595.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/88979622274.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/gaxaganapegotomagol.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/lowibibuda.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-26-18-05-06-86.pdfIn PDF document text
    • https://imperialbroker.it/userfiles/file/labixopepagidus.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329c7a0291c---51685775463.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-23/20210923013810280818.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/16130850398.pdfIn PDF document text
    • http://linklandhotels.com/upfile/editor/files/bimafitujelubuleka.pdfIn PDF document text
    • https://sainaudit.mn/File/betomizanowugi.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/tufapumugole.pdfIn PDF document text
    • https://value.ae/userfiles/file/limuvowaxisujorel.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/kuvusu.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/soduz.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/83524755378.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/161522644c5fbf---91762959936.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/90667073767.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021090213004973499.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/79793736348.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/kogimajoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=sleeping+dogs+obb+file+download+for+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_off0000b3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE4 17504 bytes
SHA-256: 8cf414b556ed48d0f42e46b1010fca815e5d7102d5ea9a379d8fb661ead8989b
font_02_sfnt_off0000f8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C9 10876 bytes
SHA-256: 7ccc361740f4843d406e7ab09f8a5c86f089dea85c010f684fa536bcc12d2e50