Malicious PDF — malware analysis report

Static analysis result for SHA-256 62478c335329521f…

MALICIOUS

PDF

68.4 KB Created: 2021-09-14 01:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1b53a92f88edd97e0acad49f4b16c8a4 SHA-1: 6ee8af27a6bde7a3c16847c6aadfb05cf22ab695 SHA-256: 62478c335329521fa3a8882d17184c6569b4f1541db89f2fb9f437bfc9df5512
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as malicious by an ML classifier. It also exhibits characteristics of a phishing lure, with a screenshot-like appearance and external URIs pointing to potentially malicious domains. The document body is heavily obfuscated, but the presence of JS and the overall structure suggest an attempt to download or redirect the user to a malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://coretry.ru/uplcv?utm_term=tubemate+free+download+for+android+cnet PDF link annotation
    • https://foodexgida.com/uploads/files/jutunuzaxudizolugozetajo.pdfIn PDF document text
    • http://muszempilla.com/files/file/57138893548.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/6551956643.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/93449948456.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/58976877211.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/pisumode.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/18682112042.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/23768722496.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/2270514765.pdfIn PDF document text
    • http://hansungid.com/userfiles/file/masiwuferirovefakebas.pdfIn PDF document text
    • https://kede.org/userfiles/file/88080150835.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/75055860279.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/84071899477.pdfIn PDF document text
    • https://combrooncom.com/contents/files/mosopudonubikujige.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/dowog.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/favematemopizozizi.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/rezijivazonirabarupivim.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/radedulevezusojiduvuzeg.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/88374005493.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/10747152391.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/35830567129.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/witiliz.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/xolazazejiniwasovof.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613456e68c0c9---vowutuwejumipenisib.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612efc914b68e---71051076538.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_off0000afe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE1 10760 bytes
SHA-256: 09a1eaa90e1e92c60094e0b8a9b6226fb7fff8b8614230c859185aa6bf5392cd
font_01_sfnt_off0000c8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B5 14204 bytes
SHA-256: 9c2229cb2c86e02ad5b4a456dd2814e1a718027dbb16122c5701c8f86ec5da75