Malicious PDF — malware analysis report

Static analysis result for SHA-256 f65da678843fc22b…

MALICIOUS

PDF

70.3 KB Created: 2021-09-16 00:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0007a364d127677f609d7012ee9c1d34 SHA-1: 1a4ee35e2d45c145edc09c6a0b1d9ea8cde2f2d0 SHA-256: f65da678843fc22b262f9f1f6930647f5d0db5a470dc7a84e396b1251177faba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Numerous embedded URLs point to disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_URI heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://drafthe.ru/uplcv?utm_term=paw+patrol+streaming+free PDF link annotation
    • http://hoangduy.vn/vn/files/winoki.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/43164555832.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/pufidetavexodelixa.pdfIn PDF document text
    • http://mousike.it/img_ins/files/fonosuzagurafiwezofe.pdfIn PDF document text
    • https://menu2uplus.com/images/file/85964120752.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/4246625636139bee2d371b.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/jefimeke.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/71015271381.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/tidoxiderud.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/165211986.pdfIn PDF document text
    • https://actorconseil.com/files/file/lawekijovi.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43148319136.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/sowejinodazes.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/9792663345.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/likirekusarevare.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/65651810986.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/80918420475.pdfIn PDF document text
    • http://baoveantam.org/upload/files/fimemagejofadafepi.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/11080752031.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/xedivedobakulefuvolikatun.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/14936476008.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/pekorazupujusomesaxesati.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/zimeridit.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/tiwisagebonavogikoted.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/55223265918.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/xefor.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_off0000b32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB32F 15628 bytes
SHA-256: 5e31482f1845ee099961a2060a6406dee1df52cfe3a134107f5c90149eb2594e
font_01_sfnt_off0000dacd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E4 10788 bytes
SHA-256: 8bafa4faa34c9709c6b4766488705970ebd0c4ee621d940187bc8633525a2be5

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