Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ffdc9974f91aed6…

MALICIOUS

PDF

74.0 KB Created: 2021-09-21 05:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ff13bc41963747c14728a69e6bc70d6c SHA-1: 9021460fdb20ff7f31090e63b0e03c81669e554a SHA-256: 6ffdc9974f91aed648e6133418356b5ac61dd097a7ea55c0bc5f98dc40de5184
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites, likely for further exploitation.

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 https://medvor.ru/uplcv?utm_term=principles+of+mathematical+analysis+by+walter+rudin+3rd+edition+pdf PDF link annotation
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3198637467.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/47213644435.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/20742386259.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/26730174218.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/61049262172.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/warir.pdfIn PDF document text
    • http://centromp.it/userfiles/files/18361344712.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/71994912546.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/pikufefepuguruginumubani.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/tuxomimatusej.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/vevameropujovapeko.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/19116325876.pdfIn PDF document text
    • http://annabarons.lv/files/files/74957639875.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/98120326099.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/teguguniwede.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/4347824923.pdfIn PDF document text
    • https://riwg.in/userfiles/file/tidasitekewad.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/90786366584.pdfIn PDF document text
    • https://membermimpi.com/contents/files/24037580071.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/nigel.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354efbbb013---rosisapifilijokulowa.pdfIn PDF document text
    • http://harlit.com/upfiles/file/76830117110In 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_off0000bb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB5F 16564 bytes
SHA-256: b91076fee5011eee5a82273f313846d2ab18c16954b57f2e64084e707b1e6fd9
font_01_sfnt_off0000e688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE688 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9F 11496 bytes
SHA-256: dd31952e03a3ab18ad04006aeeeec339dbb7870e2a43b0ba0ae754ce8c86b412

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