Malicious PDF — malware analysis report

Static analysis result for SHA-256 f59ccdc013e71007…

MALICIOUS

PDF

73.5 KB Created: 2021-09-12 21:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 482e1d2db7c040b9bcca494fb74e8d39 SHA-1: 833003a6ac19e88257b0ec9d4936d9ae038e458e SHA-256: f59ccdc013e7100772d1350c50ca3d185ee0ba28c985e2751ea976881be92669
166 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, exhibiting characteristics of a phishing and social engineering lure. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document likely prompts the user to install a fake browser extension or viewer. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it is designed to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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://krisoc.ru/uplcv?utm_term=pptx+viewer+for+android+free+download PDF link annotation
    • https://agrilaui.com/userfiles/file/53690338435.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/69b06916635e93b7cdc8a6ea54fa1cc4/53266781593.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/janikonurewuteni.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/54874905157.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138eabf4578a---vemukerenamiriwi.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/24334794062.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/18867616446.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/xapafefogenogibaz.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/18959148645.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/22520742030.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/metuzuvodi.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/12371844436.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/93959995898.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109080152375152.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/zelalezatomanan.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/51129668735.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/xavimalevelonaz.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/15670930281.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/57662303924.pdfIn PDF document text
    • https://dm288.com/slicice/file/31008301112.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/kaduvujixadogerabidowijem.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210908161639.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/nijuwuxexirukosur.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/jufakolutusujotu.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/fifikanoj.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/xamumuduloxerijivasug.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_off0000be30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD647 10576 bytes
SHA-256: a49dd41a2ca86df770a6fcd3c7a61455b020cc5fd1021b13d3490d7e3cd5dad9
font_02_sfnt_off0000ee91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE91 16080 bytes
SHA-256: 1b51e47263c53d3414b97a257de57f658aa5ef208b7128b432af99c3f4dcca0f