Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ae12ca4f7391da1…

MALICIOUS

PDF

92.6 KB Created: 2021-09-11 08:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3df8fe6d6390f104c605dbbfc09899b3 SHA-1: c5142ea9bef134fe100b719c55d29e9e52e89ef2 SHA-256: 1ae12ca4f7391da15ed1b928ecef35d01fdca02f2612ac3cf7200a9bcc3e4a90
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL distribution suggest it's designed to lure users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://idcla.net/upload/files/94575100361.pdf In PDF document text
    • http://backkwang.com/userData/board/file/99225382754.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/vorux.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/30984285537.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/tilap.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/fesixopelesobajiv.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a5eb91f0b---fuvabanifexavovilufolige.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/92364987036.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/55856907829.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/62013920140.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/gebogak.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/38219105466.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/67109148309.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/zepixuzukepozoketukezodow.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/vusisoz.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/mumumuxixepuwo.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///15978923046.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/dovegojidepitezalo.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/mijibiwevulor.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/82177372130.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/damopu.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16137d0ba17ab0---58063981075.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/tirafetaba.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/86333766352.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/zewap.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/14513595324.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=tamilgun+new+movies+2020PDF 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_off000106fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0F 17228 bytes
SHA-256: ea5844cebecce25f9d42b80298723860164fd9c63aa217ba9c65c3fb62e12b26
font_02_sfnt_off00014bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BC4 10708 bytes
SHA-256: 9c0644876e3122b01a9a815b14f75e3bf2b83cc0f1fb4340e623c0e4c036cd6d