Malicious PDF — malware analysis report

Static analysis result for SHA-256 a086fc966f8c2b2a…

MALICIOUS

PDF

70.7 KB Created: 2021-09-20 02:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 79184924b429d0a525b8945eadf02d66 SHA-1: 0074b0010e814bde832ef215407df0f747a06ed4 SHA-256: a086fc966f8c2b2a4ec494c26f6fa2b3aa7532250bb832284ed14ed1f18db2ac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable domains, and is identified as a link farm. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests an attempt to obscure malicious links or distribute malware through a large number of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://suma.ca/upload/editor/file/kibonubajakipetinulofa.pdf In PDF document text
    • http://www.companyforte.com/imagenes/editor/file/23634377726.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/99509759279.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/bexojul.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/xedegute.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16144134d4b39e---20459839417.pdfIn PDF document text
    • https://ferropula.hr/files/bukebujotosez.pdfIn PDF document text
    • https://baongochoa.com/upload/file/28761727150.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210914022040.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/90571360365.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/vinuxukerijeke.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142405b874b6---40806212787.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/56875313038.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/gidadub.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/58164269609.pdfIn PDF document text
    • http://xn--spreewaldpension-lbben-9lc.de/meineBilderAlbertGrundschule/file/lelalujobas.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/zagonovurufugu.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/gapilokutuposoxidowexeg.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/pozupemenonupuzulopuxor.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/4974135097.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/66616788111.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/nozopi.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/bubonokulefip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=hill+climb+racing+2+mod+downloadPDF 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_off0000b4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F5 15804 bytes
SHA-256: eeb19cf88ccb2d9447b9ba28d3efb9a5a5025b93372bfc0eb286792af6c2ca2e
font_01_sfnt_off0000dd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD45 10652 bytes
SHA-256: 0dc2478e1326e5a08fcc6b533d253e8ae7e5211b72dd4c92687a8b20267cc9c7
font_02_sfnt_off0000f568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF568 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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