Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6d2b8f726495744…

MALICIOUS

PDF

70.7 KB Created: 2021-09-22 14:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8b3126d3279354de77fb0adac13f6d35 SHA-1: 4c8b3ac22bf7c8d3d34758606c73964c68132d58 SHA-256: c6d2b8f72649574479e47cac89d4727fc8c4a238f85bbd0178db70c9aa4c6ff0
174 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript which is a common technique for executing malicious code. The heuristic 'PDF_RANDOM_URL_LINK' indicates a redirection to a suspicious URL, likely to deliver a secondary payload or conduct phishing. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://i-intelli.com/ckfinder/userfiles/files/7848816583.pdf In PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/zeladefifumuk.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/vetapalafagizorazeb.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/33651832483.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/43120490798.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/pozovod.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/gijiwudefufetenid.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/83629913884.pdfIn PDF document text
    • https://cebubigsellers.com/userfiles/file/tetuxegebisajuduxemazewo.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/37585660272.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/25269890178.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/31631981446.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16138e29c821f6---22841221857.pdfIn PDF document text
    • http://merwepizza.com/upload/file/99683070868.pdfIn PDF document text
    • http://aqgwegfjdlk.handyfriendship.com/upload/files/zotonaxu.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/nerixifegujajo.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/prji78694if6nnsthh016s7eb3/62829399170.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/9832574451.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/26325066661.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/vuxowa.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/64716458790.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=rigveda+sandhya+vandanam+teluguPDF 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_off0000ae5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE5F 10800 bytes
SHA-256: b63edda5ef073f6356ea2000fc703a60502c170d06683f08588602f71d32bb19
font_01_sfnt_off0000c6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000def6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF6 17368 bytes
SHA-256: 54b263aa1733e7ff729f921582c4d459ebc41ace9e6f32f7ffafcab38d67c7d6