Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a1360ae6b6daf79…

MALICIOUS

PDF

78.2 KB Created: 2021-09-15 20:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1a96e2b230c5a3f441c366ac501379e8 SHA-1: ff89dc62e93153927dfbbeda0dc6f914818e2232 SHA-256: 6a1360ae6b6daf79901f6db86d4a7d087c9c232f4850ae2f7e10ed38f371b59e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coretry.ru/uplcv?utm_term=all+apps+apk+download PDF link annotation
    • http://hansungid.com/userfiles/file/38493124940.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/xularovikafisove.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/gukivoj.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/88742887751.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/fitilijaveguduf.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/xodozif.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/munenu.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/kofosigimumebagip.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/muruxuz.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/nulaxividoxi.pdfIn PDF document text
    • https://premiersuli.hu/files/files/suziwolomurufijisi.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109011105507670.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/lukavapobidiwope.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/16977255002.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/lusilije.pdfIn PDF document text
    • https://quangtriasianwindow.com/uploads/image/files/13191736310.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b462fd19f3---66684386411.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/rimibituw.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/fapimunawixeg.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/39168533886.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f5f433da4---rejavunifuposuwumexogi.pdfIn PDF document text
    • http://runwellconsulting.com/file/file/kurelinidifus.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/tulum.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/86378587349.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_off0000cefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70F 17776 bytes
SHA-256: 6f12166c7a09ceb417313c8f04c4b95c26e52a7e7ba31bcecddfa9c52b5359e6
font_02_sfnt_off00011491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11491 10124 bytes
SHA-256: 1a8557687e3223e93097de13c1c80f041eafbd38be378b948cb678de2be31167

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