Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed0bb1a239f8ce9b…

MALICIOUS

PDF

88.3 KB Created: 2021-10-07 10:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4f7b29cb7871aac44ffac6e2d0924553 SHA-1: d8de043b09687282b129a7892a54cd66740fe4c2 SHA-256: ed0bb1a239f8ce9bf58b5f84434b6c83989f76792f6338164dd1fffdbd3b1f5e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • 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://wastran.ru/uplcv?utm_term=antonyms+in+sentences+exercises+with+answers PDF link annotation
    • http://chinalabware.ru/d/files/79360918415.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/jikamipe.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/85526717092.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161495d6bac61c---71960483808.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/38766907585.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/tefesetu.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/22880464405.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/76851603236.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/232437618.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/44995044487.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/rivomekazazogetoxi.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/kenotevafejuxedap.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/65591983950.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/nubifapoxufugagigaxer.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/75631034954.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/vatudodutemere.pdfIn PDF document text
    • http://foursservices.com/nbloom/fckuploads/file/fozexupabumi.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/3295252140.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb602b16fd---waxavonanegi.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/82462880001.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/weriviledegoxoga.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/rexadamoxodomaxavib.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/wuxexemodelujipolavivuxul.pdfIn PDF document text
    • http://104450wp19.agentcentrum.com/userfiles/files/29249691649.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_off0000efc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC4 10732 bytes
SHA-256: 49fdbd379cef50b356f8f8c94cc4d2d9e73a6f4bd055475bba75a044373ed2f4
font_01_sfnt_off00010862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10862 19680 bytes
SHA-256: dfd09aac2eec90a0b374056069d7744e4536d5f4c4d595445d6ba0f06ea14caa
font_02_sfnt_off00013b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1