Malicious PDF — malware analysis report

Static analysis result for SHA-256 97262fa74e44bdf3…

MALICIOUS

PDF

81.3 KB Created: 2021-09-09 00:12:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0cec7d81302ab18f44b0c60051bfbd3e SHA-1: d0dfee9b4cdf014bbac372aec7565f8352625c30 SHA-256: 97262fa74e44bdf3f2373a4f374bf86fe0033fb11162bdefc4c97a618031d242
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF sample was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution campaign. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://leprofit.ee/cmsfile/contentfiles/zewaluwaxigusumosuvi.pdf In PDF document text
    • http://bftt.marketsearching.com/upload/files/kakoxuxojavuvix.pdfIn PDF document text
    • http://vejwun.cz/images/77488149998.pdfIn PDF document text
    • https://kapefashion.com/files/files/43522248693.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/4962965184.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/37675036103.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/dafuworepepujojeza.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/zolinexovowemoviputusewi.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/pigexuw.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/15416163796.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210906184915_1830385616.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/70455280000.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/63595220011.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/62114881498.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1613924966c573---barekiteworuvowimafodi.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/62988260839.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366d8584e49---gexusafotuzaliwon.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/207534486.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/jafavibawijelubamijip.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/64217699192.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/9488845884.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+share+a+ringtone+on+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_off0000da6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6C 17356 bytes
SHA-256: 754ac02e8c70eadb43530e4e267b1cc625392a4421fb2cc83baaee4e2a25917c
font_01_sfnt_off00010783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10783 10556 bytes
SHA-256: ea3a0d9301ee86ae1a256eb5e7d5eb645316e8939646aea8d4e07e4407d5656d
font_02_sfnt_off00011f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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