Malicious PDF — malware analysis report

Static analysis result for SHA-256 af2bb579d2e62ffd…

MALICIOUS

PDF

82.2 KB Created: 2021-09-20 06:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 658e54b484100a856abb27eb91df49cc SHA-1: d98eeed102373fc39cae660fa72611ff1f3751e8 SHA-256: af2bb579d2e62ffd0beaf18e6613a90d7a6cddab6f393fb92b9e4964fdf55c21
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. Heuristics indicate this PDF is designed to redirect users to external malicious sites, consistent with phishing or malware distribution campaigns. The ML classifier and ClamAV detection strongly support its malicious nature.

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=buenos+dias+princesa+pdf PDF link annotation
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/9854a1a29eb69573edf5a56c2f5efd3e/65757292814.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/xepolafeki.pdfIn PDF document text
    • http://llux.vn/uploads/files/kawelubamegamevafiwopolap.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/ruvelex.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/81404399629.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/99066741086.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/pumetapalabogo.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/50201764982.pdfIn PDF document text
    • http://kasargod.net/uploads/file/78578948834.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/nidisovojelam.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/6660980085.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/131143336.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/dobuvebajajisutakivifaku.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/dibek.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/zofikeborafekate.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/5100700507.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/moraxorurozipuvifi.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/89255878366.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210908_110647.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/49674618911.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/duriseguxegaji.pdfIn PDF document text
    • http://partnercable.com/files/21062820536.pdfIn PDF document text
    • http://poorclarescork.ie/images/vivemo.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/2197298324.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f442f09f06---98769064879.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_off0000d7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DA 10620 bytes
SHA-256: 479274e6e5e2b499ade4e75ccda5f3833eded8193c8cdafd1521354c12252a7e
font_01_sfnt_off0000f045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF045 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10857 19780 bytes
SHA-256: c3018fde7c1835c30748d406b9d21b0e7c0964e5c5cac3fec9e7e6565dfb5fb9