Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc742bd7591abc1d…

MALICIOUS

PDF

92.5 KB Created: 2021-09-14 00:11:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: db561773455570f0237d086ae020bca1 SHA-1: 4c6fe4581084e3c23106d7909f7bb0a396ee516c SHA-256: fc742bd7591abc1d8e189c68e24c984a0991e9e808ddfca172bb7ee24822aa81
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://valentine.tutaylamhet.com/storage/ckfinder/files/vejoredubebevemalan.pdf In PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/futonikatozej.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d8c9bceef---woseraripotezuxif.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/garesoderiruzoluwopebak.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/25090942052.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/nulozisizinelosikefe.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/33428751156.pdfIn PDF document text
    • http://digifast.cz/userfiles/11057699497.pdfIn PDF document text
    • http://360global.ca/userfiles/file/lixoduponuso.pdfIn PDF document text
    • https://edusfera.pl/upload/file/32734449688.pdfIn PDF document text
    • http://mamtaniketan.com/userfiles/file/fosozemipoveluzaribosidup.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/327177a0c8881ba214b82cd81704b26e/xokilaxokedekogif.pdfIn PDF document text
    • http://hkacca.com/userfiles/lemutiloforedubowuna.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/mosezajobibetijelox.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/tofimipakezexoru.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210905065049.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/kidevidipazur.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/patapolefijutajatew.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/pekuvemuxipirowom.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/vutonimimi.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/kojifubomupadikov.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/ladutopododitamov.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/49435089202.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=0+day+pornPDF 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_off00010a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1F 17484 bytes
SHA-256: 110b3c5ab1be4c7e4327a29ee2852e3a62b7df31641c3c916e91582e46ac1d2d
font_01_sfnt_off00013707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13707 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F1D 9988 bytes
SHA-256: 19a17790e77b6f46480da720a68d3eda6f399a279b14a01fe91a3909674e39fa

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