Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd5e5eb786697a79…

MALICIOUS

PDF

86.7 KB Created: 2021-09-12 16:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: ff14b7ec1f780778c2ae130c297886a4 SHA-1: 832bf28e792f25bc0b7f1adc11cac759a1c37071 SHA-256: fd5e5eb786697a797233a4fbb74d660b6d7a462c1b5feebecc1d0d201c4548ac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on diverse domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of using many distinct, potentially disposable hosts to distribute links. This suggests the PDF is designed to lure users into clicking through to other malicious or spammy content, likely as part of a phishing or content-spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://tuanlongland.com/upload/files/51903132048.pdf In PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/zivujisupitikotoluk.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/rofot.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/18694453697.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/majulivojopazeji.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/tibolomugidefinexotuzeg.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210902155225712173ojtlc.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/91750806932.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/88205373822.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/bajopurasadiwadimadorav.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/90920967345.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/wimojimovufesikikazezisov.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c21653a594---putin.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/sadarinew.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/8336962122.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302d6f2587f---kilutufojibogefulabedonok.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/70408002151.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/wufunevigimesigusapova.pdfIn PDF document text
    • https://csn-alliance.com/data/files/51332686380.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/lawowuwasokelivopubezale.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/22798498656.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/kexudusebudizapowotukosej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=new+ethiopian+movie+2021+full+this+weekPDF 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_off0000e9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001020b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020B 18708 bytes
SHA-256: 17210141966b74c6f7cc64cb6cd385e6b7f92ef96d1e1b28f9e50a2900d73be3
font_02_sfnt_off000132cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CD 11140 bytes
SHA-256: 11d236be62160621facd32b9f77d85e65860b315f5b1192bc96968fa6958cf8c

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