Malicious PDF — malware analysis report

Static analysis result for SHA-256 67260efaef878987…

MALICIOUS

PDF

83.9 KB Created: 2021-09-18 02:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 51ffd37b2723a4467c98970c4597ee33 SHA-1: 98ff348cbe5dc1819f28437e29891bf0d584c96f SHA-256: 67260efaef878987874f1df9cb8d3bad24d039e06cd7bac61dd713275c2a2585
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm hosted on disposable domains. The PDF contains numerous external URIs, many of which point to suspicious domains, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the overall structure and URL distribution strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=android+recovery+reboot+to+bootloader PDF link annotation
    • https://soswzgierz.pl/web/uploads/files/gatodi.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/7046179150.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/mejasuvizutifipotam.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/xaronisiwixidejo.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/9452836805.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/43144190514.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/37667589642.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/banifapoxifegu.pdfIn PDF document text
    • http://evola.it/userfiles/files/12354997558.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135a961725c6---24756570801.pdfIn PDF document text
    • https://alev.az/userfiles/file/71015170262.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/80009036019.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/romadasisabegozuwe.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/89324939820.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/97059258826.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/00855af4631da5b789dc1a07fb4d7f8a/16535087294.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/lasedojeguragoromoxawili.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/putibavixawagifova.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/9949703121.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/nawido.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/87357474931.pdfIn PDF document text
    • http://yoron.net/up/files/47411506981.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/dopuxit.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/bipugavopatu.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_off0000e317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE317 10496 bytes
SHA-256: 6acf82c2104ddecfd5a0992535a76917952823c7f6fb617bf66263562168273d
font_01_sfnt_off0000fb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001132d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132D 17968 bytes
SHA-256: 404b269b27ce41b6f5d6bac98aeab9c49ae9086035e0d6105c832994c6eb9fdb