Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae585221a6bf8741…

MALICIOUS

PDF

96.1 KB Created: 2021-10-08 16:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 47cf6fd5c2e4ed27e899b2a99300bcc7 SHA-1: db3d9ea5f5ff8b2fe90ee6539e1cd2b5e1d62752 SHA-256: ae585221a6bf87414bb4acdb4043e27be7d67de44d9504bf5c097a6dc6d51eed
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a critical ClamAV detection and a high ML score, indicating malicious intent. The presence of embedded JavaScript and numerous external URLs suggests it is designed to download and execute a secondary payload or redirect the user to a phishing site. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports a malicious purpose, likely related to spam or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://momentous-inst.com/uploads/image/files/64601180934.pdf In PDF document text
    • http://gysanya.com/upload/file/210926044651150601yg8bf3tt7942.pdfIn PDF document text
    • https://pkmoscow.ru/ckfinder/userfiles/files/bileteno.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613757d763020---xudozumumunizojalo.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/51030684249.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/fekev.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/lotedatisatuwogawujokosox.pdfIn PDF document text
    • https://tgvl.in/uploads/fck/files/70468846132.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/kerevejiduvogajejedikovel.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/82145497850.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/21706409514.pdfIn PDF document text
    • http://accronline.com/userfiles/file/6644678091.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/jatemawukilajidij.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/54389554947.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/butekos.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/vezogusijalupelikazos.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/faxokodupo.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/27589403216.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/nezijawigerevag.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/10239861321.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/30170287837.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=panama+currency+in+indiaPDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/lubapunugusa.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_off00010b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6D 21260 bytes
SHA-256: db681946d7ebcae268d89cdadf35859df5b4117b52242b0f74b0ce20fb6952bf
font_01_sfnt_off0001437b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1437B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B92 10312 bytes
SHA-256: 96769c54c828dbd68f5f6f34438c78c765dd60705043af30230f2eb5f06f4aec

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