Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7c28a1ee8905c87…

MALICIOUS

PDF

84.6 KB Created: 2021-10-17 12:34:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: daee9d32f51e3d967b389a56c36fbec8 SHA-1: 76517fa29e7f965bc9da342f48444297a0b79ffa SHA-256: c7c28a1ee8905c8748ab1dd86812e60781e33d7a156f56172ec8b7dd72ffc86f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to suspicious domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying a pattern of link farming on disposable hosting, often used to obscure malicious destinations.

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 http://bulk-supplies.com/userfiles/files/kosimug.pdf In PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/72380297396.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210930223208.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/revisusisigadelis.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/bororebenuwukiradeza.pdfIn PDF document text
    • https://coevent.ru/upload/files/kudesadat.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/poxaloga.pdfIn PDF document text
    • https://vgcanada.com/userfiles/file/demokedikewiw.pdfIn PDF document text
    • https://desarrollostecnologicos.condotiero.com/imagenes/imgeditor/file/nujegomuvutidivegiw.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20211010_5B129EB8D82606F8.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/73043461376.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/xubef.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/4279885696130f91fd3dde.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f01179eaf6---zogiroverunuxelosadosorib.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/wefawezetezuwekope.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/33246175676.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/wovoja.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/mejofuvowekul.pdfIn PDF document text
    • https://servicenter.ro/ckfinder/userfiles/files/fivuvimezibapa.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/kofazipimof.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/texob.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/65933516297.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/21377536222.pdfIn PDF document text
    • https://jin-ji.com/upload/files/18746622642.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/34480973674.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/6Zflnl449io/uplcv?utm_term=convert+word+to+pdf+online+free+without+emailPDF 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_off0000e4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE2 10876 bytes
SHA-256: 9848ec45e41b2183f2c0a8b835bf2471c2d4751bfa448b53d2517fb4bb7aa89d
font_02_sfnt_off000115db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DB 17992 bytes
SHA-256: 2f2f90286ed277ca504b97b1c3e5f85714d34deb7fadf27ed4605065301d2cbf

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