Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2d756aa907f25cc…

MALICIOUS

PDF

79.2 KB Created: 2021-09-19 09:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8e5eb0f4e24809579987aed9a1713cdd SHA-1: ce2c6b4e2018dff4e657c192ae39b93badb5925c SHA-256: c2d756aa907f25ccbd1bfc269ea85e0ea33cd88dea0e36bc2630a22bbc5c3524
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable domains, suggesting a phishing or scam lure. The presence of JavaScript indicates an attempt to execute code within the PDF viewer, likely to facilitate further exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=flute+trill+chart PDF link annotation
    • https://arte-salon.ru/upload_picture/sizunefujoxiwikulatexuzok.pdfIn PDF document text
    • https://kamionosnyelvlecke.hu/userfiles/file/2758906216.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/39609254846.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/83419471897.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/27885189942.pdfIn PDF document text
    • http://iwort.de/userfiles/file/79305197152.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109062049501106.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/43977719796.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/lonuxigakukinegivuwewubaw.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/75327079684.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/dupatisomonazex.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/7852727031.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/44014327156.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/67044215918.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/56808594058.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/wovawusasozesika.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/45075136254.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/62209305797.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/bkagphca22362qdl6k2c3pmlo4/dasivemutufamuwofesako.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/65025962464.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/xitawalixugupedesog.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af906c60b9---5085977535.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/pewuxevukitabixi.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/kozetakedujupatufidux.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_off0000d35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB71 17412 bytes
SHA-256: 60736a9e8fc614a7b8e1f7aa1716b6add160c3859053e2ba7a46b93bfe8856ee
font_02_sfnt_off000118f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F6 10012 bytes
SHA-256: 5723606948a91b0c28f299326c29b6a4cc4d53f2893c0af38f8f902d4ad12f13