Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c9dd3f6f74c75df…

MALICIOUS

PDF

72.4 KB Created: 2021-09-16 11:30:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ec9ce91a3424be3f15f404f8e035d1bd SHA-1: 79c0db686ea7d68a21213f9e16ac22ba248dffcf SHA-256: 7c9dd3f6f74c75dfcaa6e8e9bf96b14ec43851c9bb665fa6e8afae84235415e2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs pointing to link farms hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=adb+install+force PDF link annotation
    • http://gelinyuanyi.com/upload_fck/file/2021-9-7/20210907023319590842.pdfIn PDF document text
    • http://briztravel.com/upload/files/kuretatamodabivofep.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/16500822794.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/nawenadiditewate.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/tifatejamuvupajudulajof.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/92908501813.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/feminoguditakot.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/57641780901.pdfIn PDF document text
    • http://fructusartis.com/i/File/76250987498.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613104cc9105f---wirolataxamumimefowisefol.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/telasepufedobogi.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/parasixefoz.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/lufis.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/27520325104.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/61969433452.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/qoitt593gj1ghskpdmlc4j88k5/xupejatosa.pdfIn PDF document text
    • http://www.rsvpcatering-ar.com/files/imagesfile/jexenarurotesin.pdfIn PDF document text
    • https://euchebnici.com/img/file/setanabodek.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/99762517126.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/47967261086.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/tixesutumozaxejepikonaz.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109082231153481.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/siwutulazozifafe.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/43315844456.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_off0000ba3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA3C 10592 bytes
SHA-256: 9f6500cf1dd16eb0cede0a9c780a9898473ed7cfc7bb14981ba64bb9385bef42
font_01_sfnt_off0000d294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD294 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eaa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA6 16268 bytes
SHA-256: d99f5032a7f134105af901cad32884e7fc976b3b19e1c418c2848e1e297c3126