Malicious PDF — malware analysis report

Static analysis result for SHA-256 da39f294c15f41b1…

MALICIOUS

PDF

82.3 KB Created: 2021-09-09 06:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cef3fa167ee368e3f82fa3a5008a34ae SHA-1: 410c1cf600643d5a67915125badefe99343aaa86 SHA-256: da39f294c15f41b1ec3168a2c683073bd162d8367e8a9fab6eb47e528c67eb42
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://wmc21.com/ckupload/files/viwosodekemexitisib.pdf In PDF document text
    • http://vinczeandlaszlo.com/upload/tiwesaterulukobuvuk.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/21288474854.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/zagozitibaxivamun.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/6042413538.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/silawinowas.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/6781245163.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/54742051815.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/86185640418.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/841584630.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a2bd6e65e---nifotuxikapasag.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/65261044243.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/wonovibenilopulamokibus.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/28672519323.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/84976398056.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/61544553722.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/7374481023.pdfIn PDF document text
    • http://cmtsport.com/pliki/25714823070.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/6680885608.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/fff566e9a0ebce4796161cd5909b6607/40510696476.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/36111214236.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/71784421165.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021090515075761.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=wr3d+2k20+downloadPDF 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_off0000deb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CC 10336 bytes
SHA-256: 5b68b559e6c4f854705ebe4c8b56c87db77bffdcd5a48e968f8d71b5e6758dc4
font_02_sfnt_off00010e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4E 17424 bytes
SHA-256: 1e0e96d0a48064ecd4025c269caf5657c08144a327cb674908f62df2c33cab86