Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cb45678b3e092fe…

MALICIOUS

PDF

75.9 KB Created: 2021-09-19 01:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 24a69c41997c06bfa4ccb5c2ba75f2db SHA-1: f1ab74636b71bcbd146866eb5ac082260985d669 SHA-256: 2cb45678b3e092feb88f5791e141e1d363ecf42049bf4e07de99a53d3fa58aa6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs that point to external sites, suggesting it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies the document as a link farm on disposable hosting, reinforcing the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://cructi.ru/uplcv?utm_term=call+of+duty+mobile+unlimited+cp+apk PDF link annotation
    • http://offerparts.com/upload/files/xuluxizo.pdfIn PDF document text
    • http://vladekoservis.ru/files/mamiviromenofisamataku.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/garufumato.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/bofuvezodarixelisibomipor.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/42110702034.pdfIn PDF document text
    • http://vitcongiong.com/uploads/files/pimasi.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/11551649180.pdfIn PDF document text
    • http://placc.info/up_image/vitosomebexojevewewakinaj.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/16095561875.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3a9f3c0ab---26342890599.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/garer.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/80942915315.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/14486691742.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109030459006849.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/wiraterife.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/gireximavunud.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/29179256220.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/31593030304.pdfIn PDF document text
    • http://iltorg.ru/upload/file/28148386684.pdfIn PDF document text
    • https://ms01bet.net/contents/files/xajugo.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/rugumuxafogopi.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/semoviwuju.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/91035213715.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/famajuluvawudinokawotog.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/b050e23a6fe184a395517494565aaff5/56144754158.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/winusugata.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/jibirujisakoxu.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_off0000c234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC234 17560 bytes
SHA-256: 9cfea3e1d3824ef56d8ad5a2650425683d2ad23d4b5eaf7bf41dccb767ff5fda
font_01_sfnt_off0000efee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10805 10988 bytes
SHA-256: 1569785a5fdd5628c5ab5bfd5c9ec1b30e16f6b6b3dc723e3a8b2ffa98ae6649