Malicious PDF — malware analysis report

Static analysis result for SHA-256 61c46cc98077812e…

MALICIOUS

PDF

72.1 KB Created: 2021-09-28 01:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 86d63b80d86dfbbecea999fd3ec96175 SHA-1: 5d8e4da1c132747f49a4403b2af8e6c0466ab36c SHA-256: 61c46cc98077812e6235ecbc8682cf85910d54614f6b7f49728e7a0454a660ef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pixomot.ru/uplcv?utm_term=positive+adjectives+that+start+with+c+to+describe+a+person PDF link annotation
    • http://polenes.cl/userfiles/file/semurixipefuta.pdfIn PDF document text
    • http://surestegc.org/documentos/file/89660447666.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/tobuliserurik.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/58490607605.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/48013310377.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/goteweratokesadetifoguxek.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/90605162402.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/manabixiku.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/gimemogub.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zozafefilulojekaputexaroj.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/xurapilezapu.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/mepofegozizefep.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/zevub.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/nevufiw.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1632337771.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/71040011450.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/75937157592.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd2d268a06---bapomavazinur.pdfIn PDF document text
    • https://intersat.lv/files/file/10001248195.pdfIn PDF document text
    • http://pk.mo/userfiles/file/35391259239.pdfIn PDF document text
    • http://moristas.com/userfiles/files/mitan.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/6208473895.pdfIn PDF document text
    • http://ducnhua.com/upload/files/29853215147.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/sudug.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614168a20c264---zawalexudejupexamafetagik.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_off0000b52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB52E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD45 10988 bytes
SHA-256: 4a92fac9534e1fa2170a92985eacad8794bfa42fdc359e052f8fe021111cb37a
font_02_sfnt_off0000e693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE693 17284 bytes
SHA-256: 178fe739f8e6438afd65278b072ae639c2012f4d09a59689bc467352b32b756a

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