Malicious PDF — malware analysis report

Static analysis result for SHA-256 3867aabcda3610cd…

MALICIOUS

PDF

78.9 KB Created: 2021-09-17 13:17:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d064e44f2339db0ce30d629e8d2a2309 SHA-1: 559d73817bc9dd54c3a20198096f47ff5622b8ce SHA-256: 3867aabcda3610cd4c5f6ca18563b1bb1b88c931f1ed7cc82f8f7f627dafe332
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. The numerous embedded URLs, such as 'https://medvor.ru/uplcv?utm_term=how+to+get+more+coins+in+cod+mobile' and 'http://ativn.com/upload/file/32737837680.pdf', strongly suggest a phishing or spam campaign. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://medvor.ru/uplcv?utm_term=how+to+get+more+coins+in+cod+mobile PDF link annotation
    • http://ativn.com/upload/file/32737837680.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/62c54c6da639576f8dc9ec697a9094a6/rifinivupitur.pdfIn PDF document text
    • https://razredna-nastava.net/files/raxuzofi.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/40729037660.pdfIn PDF document text
    • http://lobi.md/userfiles/file/30841606367.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/xifafutojetap.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/71369985896.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/movaraxileribug.pdfIn PDF document text
    • http://npas.ru/pic/file/pulesorewadusosezodoge.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109151543285734.pdfIn PDF document text
    • https://srsatta.com/ckfinder/userfiles/files/rakogatefabine.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/siguvasatilufofa.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/95557277922.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/65754295503.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/sumijo.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/65479849056.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/44810327058.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/vaxisan.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_off0000cfe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F4 17692 bytes
SHA-256: a421c0011fcd00abe93189b8f1cdea7dbf2a77cfff9362f056be7bcef29d3f99
font_02_sfnt_off00011579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11579 10768 bytes
SHA-256: e11772071d4a0beccc7ffd1e3ddf8f85ea8affc2c34e89a3368fe496536d6db0

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