Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b93145ae15fae38…

MALICIOUS

PDF

78.6 KB Created: 2021-09-11 00:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 88c5bd0efffcc7ad8c109be7ee46a15f SHA-1: 2793b6e6e298c403feee57a894f730186ce12682 SHA-256: 6b93145ae15fae3841d9f1153ef58f0a362941d863ca2b4fe94f8d68f94f22af
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, with one heuristic specifically flagging it as a link farm on disposable hosting. The primary purpose appears to be directing users to a collection of other PDF files, likely for malicious purposes such as phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130d08e3efc2---bupatulaginuxodifo.pdf In PDF document text
    • https://triatlonshop.cz/userfiles/file/getememunojizobusipo.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/89911273429.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/83757475799.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/63626303427.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/gusewunademunobumejuzaruk.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/24891947811.pdfIn PDF document text
    • http://congtyvima.com/images/Download/vejulozogexamukizosomesen.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/jidavimuz.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/30648047993.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/xufuvuvanebilutarib.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/xezujowodubujasabulakorav.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/36282221977.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/47988570538.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=chocolate+doom+androidPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/86618760788.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_off0000cf15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF15 18144 bytes
SHA-256: 798d073be41b415e61d50b0facf930a86c648e2cf24ec5d441043908ca997839
font_01_sfnt_off0000fe0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11622 10496 bytes
SHA-256: 726949b9d3974462ce06652ed0fd394caceb7f76e5eec05b0443e762e01a0172

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