Malicious PDF — malware analysis report

Static analysis result for SHA-256 3de4476275df302b…

MALICIOUS

PDF

83.6 KB Created: 2021-09-19 22:33:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 21323f4cb989c8e8921eed9302375c7c SHA-1: 994e355ec7768ef3884f7da42aeffef5e08189ac SHA-256: 3de4476275df302b407dac9be08f2a8a5645b3f0f64678160a59459b98176b47
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and numerous external URIs, indicating malicious intent. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware distribution document. The embedded JavaScript likely facilitates the redirection to malicious sites, as evidenced by the high number of external links found.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=phone+spy+app+android PDF link annotation
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/44252112563.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/xebaropetonez.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/5f5b5c6b63fb5efe386d738998ba02bf/94194181286.pdfIn PDF document text
    • http://anm-av.de/uploads/files/nagerazexij.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/xifezulijupodeziragegi.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/bizinujoripifidububedi.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/92481810251.pdfIn PDF document text
    • http://vkts.se/userfiles/file/tafuvijamesapazufa.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/xotifuvano.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210910170347.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/49980071557.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/tametamigiwejuvamixa.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/39223705091.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/zufotam.pdfIn PDF document text
    • https://graphicart.ro/fckfiles/file/91902800665.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/36087123234.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/lupukodi.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/8878197380.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/44773640389.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/27521209031.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/dosodapisumifumataseb.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///11948740411.pdfIn PDF document text
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/78237370215.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/60479662729.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/99878552732.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_off0000e168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE168 10460 bytes
SHA-256: 78e8b5e2df1bad56f6d78ebacadb3a3b5cb0e73f1df4c5820afccf88d4b12155
font_01_sfnt_off0000f912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF912 18180 bytes
SHA-256: 94aa55be03d64a94d7df579645e83d20aa05ca402f8584bb4df26873e1ccf305
font_02_sfnt_off00012886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12886 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1