Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0cc1fce0962e93e…

MALICIOUS

PDF

73.1 KB Created: 2021-09-17 22:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9d3b599abf5584378e409c75bccec865 SHA-1: 368d28cbd7be6c26268a734814c0a14e56c156ff SHA-256: d0cc1fce0962e93e56795bf6f95dc0dfefa8038a839fe0faf167e25fab7f1da8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic analysis identified it as a link farm with numerous disposable URLs, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content, likely for downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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.
  • 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://xedaptheduc.net/app/webroot/uploads/files/xiluser.pdf In PDF document text
    • http://tsrmmessina.it/userfiles/files/52046350702.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/33881254600.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/65038885425.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/7883453486.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/vovisepoda.pdfIn PDF document text
    • http://hzqzg.com/d/files/pilumerevifomemokuj.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/teferodo.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210914_42E1FC4A7B47261B.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/bfc6544fbbdbcfc5acd372cd14b8626c/bivawexutobafurabeb.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/33465018576.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3e3749a03---21870691390.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/nibutet.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/96089283126.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210911160801.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/ruzupedimukepozafurekugir.pdfIn PDF document text
    • https://fond.ru/userfiles/file/96356767531.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/71330941529.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/pepadogitipivexibisomerir.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/vunovikomovufiluvipiretul.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/51295049976.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=assassin+creed+2+apk+free+download+for+androidPDF 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_off0000b967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB967 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17E 10796 bytes
SHA-256: 372a2774a283a61619314e9a5a851da01c5ff7359535cdbff3204e0dad80020f
font_02_sfnt_off0000ea96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA96 17112 bytes
SHA-256: ff578e629813c59ad08c2ab73702ed2c8329f80c9d73c27d26094b8d318eac92

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