Malicious PDF — malware analysis report

Static analysis result for SHA-256 43ff54b8370454e2…

MALICIOUS

PDF

89.0 KB Created: 2021-10-08 23:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d2d00ffeca9052e369cc515173cd11f2 SHA-1: 437bcff60b323d15560f1b7d150ebd897ca428d5 SHA-256: 43ff54b8370454e28565292c74f69cde5338a46e2679bb332c284b66cce8c505
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous external URIs, including one pointing to a raw IP address, and a heuristic indicating it's a link farm on disposable hosting. The presence of a 'download button' lure and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • 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 https://smidgel.ru/uplcv?utm_term=how+to+retrieve+excel+spreadsheet+not+saved PDF link annotation
    • http://aotmoo.com/uploadfile/files/20210924_024622.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/duliv.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1615e523095a39---73740162614.pdfIn PDF document text
    • https://seerupit.dk/assens/file/xusotiridunikogi.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/2534983437.pdfIn PDF document text
    • https://andhimazhai.com/images/files/ziwez.pdfIn PDF document text
    • https://soechi.id/userfiles/file/63133221683.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/nofugavi.pdfIn PDF document text
    • http://sin-hua.org/userfiles/dorizitadejorinomof.pdfIn PDF document text
    • https://nistd.in/userfiles/file/36749429636.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/ridanelogosi.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/52008774732.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/sasuparogarix.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/22922167978.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/81206668950.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210926020228.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1615a50125196f---22827957489.pdfPDF link annotation
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/sokefurasuvedijubukelevep.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/29064084897.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/guxosatosenuwev.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/33596646276.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/dolukuvimodilibureralemum.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/15427479058.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/60702777139.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/92055894913.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_off0000f13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13F 19840 bytes
SHA-256: 0c416e4a682e7c792c7d538a2cb3de132dc7f09153a82459abf05d11f1979cf5
font_01_sfnt_off00012558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12558 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D6F 10856 bytes
SHA-256: cbd7a402ed4fbc6fb0c083582f7c50c875a69b8c085c31e19691b72f2e850985

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