Malicious PDF — malware analysis report

Static analysis result for SHA-256 4559c63ee8b42e5f…

MALICIOUS

PDF

81.5 KB Created: 2021-09-13 15:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 358b0423072b2669e80c4ae9f06d8699 SHA-1: fad3c995da44efe276948dcf3525d4029ce03fc5 SHA-256: 4559c63ee8b42e5f256c832e8e388153acfcfcd34201a7289874352cc8df213d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Numerous external URIs were extracted, many of which are structured as link farms on disposable hosting, suggesting a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a large number of links on distinct, potentially disposable hosts.

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=don+bradman+cricket+17+for+android+ppsspp+download PDF link annotation
    • https://vietnam-pump.com/userfiles/file/65820406606.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/buxuwigupavozefite.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/4293437301.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/forazekujesudubegiv.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/gipefiga.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/wazojinumiluwiwafisovejet.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/tiforow.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/golagarinesezebaveze.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/59912022669.pdfIn PDF document text
    • http://93564497.com/userfiles/faxeneruwibemexa.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137cde08356f---30098409639.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/80040611539.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613704b34f33d---fozejafugodunowozuxolozo.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/lovune.pdfIn PDF document text
    • http://samtle.net/ckupload/files/47638306709.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/79985475549.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/77290631489.pdfIn PDF document text
    • http://kco.su/userfiles/file/60325197887.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/vikubujozaxupebiv.pdfIn PDF document text
    • http://abnicum.ru/files/file/89394381973.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/97545217896.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021091020525184.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/poliwusovara.pdfIn PDF document text
    • http://tzsunup.com/upload/mikel.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_off0000d820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD820 11204 bytes
SHA-256: 696c99ef641d3107e1624972724c8e1830ea09efa56d38c186db432d9af1163a
font_01_sfnt_off0000f241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF241 17484 bytes
SHA-256: bc5d1bbee1018739e19f09d1d02b5383005856537154e73f226b9218f2e3acb1
font_02_sfnt_off00011f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.