Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1fcf0c2b0cb3834…

MALICIOUS

PDF

74.5 KB Created: 2021-09-21 06:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 762f1ea1a149b067a1f0f8cc130677fd SHA-1: e1430cba3e37072b59d9a9138a5f25db1a90b7a9 SHA-256: c1fcf0c2b0cb38341add83b96c6acab4d0d39a6c8ac213f32e67fad47b54d99d
146 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with several heuristics flagging it as a link farm on disposable hosting and one pointing to a raw IP address. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://lnaixi.com/userfiles/file/20210903140101_1850974164.pdf In PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/depuzozosufuvide.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141406a7e500---42294886119.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/fukisuxagogafiforedolisuf.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/suluwewokosalovodipo.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614175019831b---49919492189.pdfPDF link annotation
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/vunesenubejugam.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/momogegupediru.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/tetarowanofava.pdfIn PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/90427432519.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/keroloxevazususikivibi.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/voveriguviferepajoxugimo.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/50729331337.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/dinukatasudasujam.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/91829672673.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/delesizagugiwomexi.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210917_73B041BEDA90C2B9.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/pojibomelimijefezufoxudi.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/bulapano.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/lezuramolaxubisafajes.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/63346823676.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/45329670446.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613edf60039e5---5421941739.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=best+offline+singing+appPDF link annotation
    • 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_off0000bfae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C5 10488 bytes
SHA-256: e81427b0ab37cef918562be5437c20e2dfbbb66c35fa2e41f380611230c7956f
font_02_sfnt_off0000efc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC4 17112 bytes
SHA-256: a7d440256e91ce9ec8252933251d601f526035bf6dd5b60408064ae6d2973bee