Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ec6fee13ae738ff…

MALICIOUS

PDF

74.2 KB Created: 2021-09-14 13:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 284d99f13002af026a7d1c68680f0f00 SHA-1: 6973a35714edd8860bae376553386143421abe9e SHA-256: 3ec6fee13ae738ff313a6b499d508038d506b8445ddb18ffb4278e11675a720c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs pointing to a link farm, suggesting a phishing or SEO poisoning attack. The document body is heavily obfuscated and unreadable, but the presence of external URIs and the link farm heuristic strongly suggest the document's purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=fancy+pants+switch PDF link annotation
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/7121562725.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210907220128.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/lafupad.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-05/images/files/49657151868.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/garogaj.pdfIn PDF document text
    • https://baoholaodong24.baohohoanglong.com/userfiles/file/kuzot.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/21034811971.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/55839774119.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/bazesegiguludovoviwen.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/gububumuwigofixekotivor.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/dodupugon.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/girarevimalixu.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/mividokodoserozaroxuji.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d137544a27---86069066141.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/jowogofodukejifibi.pdfIn PDF document text
    • https://cebrium.ssnn.ro/images/58087853422.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/55852859722.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/tidezupagewuxanuduxadibu.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/xisiduliregegabavi.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/xeputebuwupamuvepeni.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/xubapob.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139dfaf49689---foxesoxifinerowuk.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/vedawivovejevujumegosomi.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/leboxiwonodetafuritobab.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/69601018691.pdfIn PDF document text
    • http://hitechdentalhouston.com/uploads/files/baxiwuj.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/dajidadaseve.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_off0000bfd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD4 10248 bytes
SHA-256: babd57a288ae898bc31ee58784e0d4e59d60132363c334cae3d98a5fe1bfedc8
font_01_sfnt_off0000d6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E1 17116 bytes
SHA-256: 5501a879c251c2a7770bc6f05d8be39efd530c13f536da082185761ddf24674f
font_02_sfnt_off00010347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10347 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1