Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2cc2d50330a5c1e…

MALICIOUS

PDF

86.4 KB Created: 2021-09-12 13:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 51cd21c4a6620f1ecbd66abf5d92c61b SHA-1: 564b5798530b0a8478e45f709d43f025ab40d664 SHA-256: c2cc2d50330a5c1e553f3f92bb22478267061ace28731e21ec293eda4fd7b78b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript suggests an attempt to exploit PDF vulnerabilities or perform malicious actions within the document context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=country+life+harvest+day+mod+apk+unlimited+money PDF link annotation
    • http://studiofagiani.eu/userfiles/files/98039604895.pdfIn PDF document text
    • http://vuason.vn/upload/files/kijifaxa.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134387d32571---13229959626.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/40b25bfdee450c43802806bdc2291c5f/varukifonewilofo.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/sigumuxut.pdfIn PDF document text
    • https://nevisnews.com/userfiles/nemabumumezezawegiwi.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109021227574763.pdfIn PDF document text
    • https://novsport.com/content/File/65065704529.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/vanupoteziwuveraxokarigor.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/nazuvoladixejuvarita.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/nesep.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/kavizobulanadowuburixo.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/ruwatijiwotelagoxag.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/tizomovoxosexebudewe.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/90314919808.pdfIn PDF document text
    • https://badoza.net/userfiles/file/zaxulotefoxoki.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/jomug.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/33605362073.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/tidapat.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/7747873861.pdfIn PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/74466261764.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/74649618c1a25291c9e8cc4aac96c742.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/42842967448.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/lapuwijebarutavuse.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_off0000ed9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9F 17092 bytes
SHA-256: 2a485d6adb2fd8e536b67326cb6125053543cd934fd7bd912eb8fbede27ffc17
font_01_sfnt_off00011986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11986 11164 bytes
SHA-256: 668b96fa57bf9c96582957e8cebdff0e1736c4631a9f735f5a5c7d81979289ae
font_02_sfnt_off00013384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13384 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1