Malicious PDF — malware analysis report

Static analysis result for SHA-256 d66accef2a8909d2…

MALICIOUS

PDF

81.5 KB Created: 2021-09-21 20:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2c2df018b927dbe7d371f0210e066811 SHA-1: ab88f5b6ecfc981bea7ab4a1a41059141b83ede2 SHA-256: d66accef2a8909d2ca9e3542fcfce708d851d035c0a6ca62023e27ab24297c8a
142 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links to disposable domains, indicating a phishing or malware distribution attempt. The presence of a visual download button and the ML classifier's high confidence score further support this assessment. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=how+to+find+deleted+photos+in+file+manager PDF link annotation
    • http://iberia-ex.com/images/blog/file/89283741956.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/88301769103.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/50830791834.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/bisujujuz.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/fadodesur.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/41829320493.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/3956735735.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/68209484778.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/2655532709.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/21954679708.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/rarovejuzepuxuludu.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/sanam.pdfIn PDF document text
    • http://trubaopt.ru/content/file/jafamo.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/gawedevejegozumivituroro.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/rexitoritifa.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161424895a02fd---zukekaxemotik.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/kawonegobakoxetamitebadek.pdfIn PDF document text
    • http://tuivaivietnam.com/uploads/files/damagani.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/51185304760.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/60130072008.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/37008927622.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/4553619378.pdfIn PDF document text
    • http://goref.ru/files/file/fipiguxuforijetewefisi.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gazaxakik.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_off0000d926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD926 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF138 17572 bytes
SHA-256: 46a028c369f9b33ba452477e0c3ac085d7a4d95be4c5a62f8f2577fac64d4e73
font_02_sfnt_off00011ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDE 11020 bytes
SHA-256: 54c48c09cf22a0b5ae2c32ebbdf68951624b79c8b251a2144aa5f18bd5165c0f