Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c6a93cfb74fbd4a…

MALICIOUS

PDF

69.2 KB Created: 2021-09-28 05:33:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ac3fa2c9e45703b9928c805006fb5d90 SHA-1: da9ef06841149d8ee561f6c8fe9b5c9f8f9e2965 SHA-256: 2c6a93cfb74fbd4a5e1aaf17c4b7bb17a5e231052655ce5d3c54e5fcc72bb9ce
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pistant.ru/uplcv?utm_term=cyber+fighters+premium PDF link annotation
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/jewaderagike.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/vejumoguxafabipajile.pdfIn PDF document text
    • http://www.emploi.nat.tn/ckeditor/ckfinder/userfiles/files/4761714757.pdfIn PDF document text
    • http://teakdeck.pl/files/file/tuvemesogekusepipudike.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/sapulepezelonebuwafemona.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53583322884.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/16837043370.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/remewivopokixumamo.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/8174446735.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/sirisadedofabajinaxizoke.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/55466600450.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/49328883353.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/fivididuxiwonunezapan.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/4262269651.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/nanawupolebuviwevuwepal.pdfIn PDF document text
    • https://zzwgjx.com/d/files/41965875751.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/6551701450.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/55680235115.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/xutavegalijivukipalekopu.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/54539209367.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/72481985131.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/32834720742.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/padatonulekupadavole.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/gadejoworuxurazixifi.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_off0000b265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB265 10760 bytes
SHA-256: 0eca831381668624215dce88a6e4d0781258d466291ab304314d8b34a9c00215
font_01_sfnt_off0000caff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE311 14388 bytes
SHA-256: 21dec6e1947ede7b84e43237f1e8c1797b7c7635eb74ea0d10a2a45c291778f8

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