Malicious PDF — malware analysis report

Static analysis result for SHA-256 afd768e753eab619…

MALICIOUS

PDF

70.5 KB Created: 2021-09-10 21:36:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 22af4673f19290348f1f93d7a2d99972 SHA-1: e99bb3d6f15ac2e858892ef6cd01460f86d07f4f SHA-256: afd768e753eab619f370d19325ba9b0549af987fa7e85b6ab9feac68d73bca8c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to potentially malicious PDF files hosted on various domains, indicating a link farm or redirection scheme. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high number of distinct hosts strongly suggest a phishing or malware distribution attempt. While no scripts were directly extracted, the ML classifier and ClamAV detection confirm malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/65857906751.pdf In PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/12650208782.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/72567176433.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/55556469739.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/vimonaruzuwef.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/ferivefexuromekizawet.pdfIn PDF document text
    • http://polkovnik.su/upload/file/pokemisusovapizovari.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/vonadijitakufiwamejo.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/29878533687.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/14481114569.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/rupogawovubekodab.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/33406352794.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139206e62596---lukorurururaselidutat.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/bovegofujufavuvowibasib.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/kadiku.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109071759253737.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/32830017047.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/retovatinutaguvenitezi.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/birisivedupivez.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/gulirajip.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///96794069704.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/09r31qs21580t7nfa4ie4gacbj/kavomefowovubinetoge.pdfIn PDF document text
    • http://ruizhishengwu.com/uploadfiles/file/062249215408.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/sevaxe.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/72399585506.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/9939261104.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210908060011.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=skulduggery+pleasant+book+8+pdfPDF 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_off0000b2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F1 11312 bytes
SHA-256: e482c859f1889f21310a70f1365163d5ebe739f8c47e5717f0680c1402a1fb80
font_01_sfnt_off0000cd46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE558 15276 bytes
SHA-256: 17e784b662a51b19a0a4a9dfc983b2f9660288503125f16f7baa236fb6001fbc