Malicious PDF — malware analysis report

Static analysis result for SHA-256 f673f8857712168e…

MALICIOUS

PDF

81.0 KB Created: 2021-09-13 03:33:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 07b9a24fe2fdb1135a8171add74ef2c7 SHA-1: 584c2820fa794b4ceea26058d88cefd3b5643b13 SHA-256: f673f8857712168ebf53a5d2c407c8ae87edb1ad852de4679996308d7c2811b5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs, many pointing to disposable domains, suggest a phishing or malware distribution scheme disguised as a 'pdf converter free to excel' lure. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://osteriailgalloelinnamorata.com/userfiles/files/3835639148.pdf In PDF document text
    • http://ippinnudon.com/uploads/files/24594478493.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/49933c7316630679d919b325ed4cc1e7/3187636260.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/wevurexa.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/zejasesiguwebutifixopub.pdfIn PDF document text
    • http://chamdure.com/DATA/files/30903498582.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/24488543783.pdfIn PDF document text
    • https://slide-bearing.com/d/files/zijeror.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/dikedeloz.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/95398013593.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/tagif.pdfIn PDF document text
    • http://chongros.com/userData/board/file/20653049847.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161348bb789668---35628273580.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/makujebogefoguti.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/11513440949.pdfIn PDF document text
    • http://caramelitos.sk/files/90457685122.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/pizajuririjunib.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/vetajumozijazef.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021091215242473499.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/95224526439.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54256412748.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-1/20210901154934101996.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/tazin.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/tanowiweg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=pdf+converter+free+to+excelPDF link annotation
    • 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_off0000da28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA28 10216 bytes
SHA-256: 15a779ae640e1a6be44dc91569731a52fa9e098d1a8500860285bbd26d0b2f53
font_01_sfnt_off0000f13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13E 17264 bytes
SHA-256: 8e7dcaa3f808c352f40f7b663a5afd7e1b6398b3d6a0d7ce5c820786a090024d
font_02_sfnt_off00011e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1