Malicious PDF — malware analysis report

Static analysis result for SHA-256 53bd00cec1019343…

MALICIOUS

PDF

84.7 KB Created: 2021-09-19 15:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cbe7ceaaf52aa0b734118f58c24d4f10 SHA-1: 83fdaa91426190fb0e691df8ea4ecc23709b2a49 SHA-256: 53bd00cec1019343a0affe301709996e8f2fb8b28a2d81b5e7f253eaeb9feb7f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection as a phishing trojan. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates it functions as a link farm, directing users to numerous distinct hosts, likely for malicious purposes. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to potentially harmful content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ispartaorganizasyon.com/ckfinder/upload/files/76698724693.pdf In PDF document text
    • https://clubsecurite.fr/webroot/upload/files/jazoxujitilebogorifol.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/51561862363.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/65101206969.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/92608152952.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20219141446127485.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/mosor.pdfIn PDF document text
    • http://mextro.de/upload/files/73976374928.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/litapidimufa.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/85982508207.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/72502754940.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c285502802---77701740541.pdfIn PDF document text
    • http://ijfbn.com/editor_up/89751193848.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/36729390669.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/45950134211.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/ksp4o3nh0q8jjpci17n5tkkuhq/bamiwimewisujadibuferigob.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/24705910645.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/78124858351.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/41555707492.pdfIn PDF document text
    • http://falconltd.pl/cache/file/pudovakukogufuretuwum.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/34735170532.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/wisopatagonopodawugejinon.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/72933108285.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+do+you+enable+cookies+on+your+android+phonePDF 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_off0000e577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE577 11036 bytes
SHA-256: e4f6f0837b0e64c36f664b0740b76b105c33229b7242ef969d8a7c7cda86b2b8
font_01_sfnt_off0000fedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116ED 17620 bytes
SHA-256: ea67952f37a790af14273b2a374712deea40b9a155aefd4ffd899546256595d7

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