Malicious PDF — malware analysis report

Static analysis result for SHA-256 43dd83ba68e309c1…

MALICIOUS

PDF

72.1 KB Created: 2021-09-18 23:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7c255f586090983272ee168b154258e5 SHA-1: eda2fa7ffd229bbfc304dc5fe00254be44567f98 SHA-256: 43dd83ba68e309c17358d161e80d0a32834276435a2bff770ccdaea7638174ae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm containing numerous links to other PDF files, suggesting a phishing or malware distribution campaign. The primary attack pattern involves directing users to a collection of potentially malicious documents hosted across various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/9761rhtpjt8inm5hqo3q6ca3ka/kevuzax.pdf In PDF document text
    • http://kimsanghun.com/upload/userfiles/file/20219121111142606.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/7899336932.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/robowakinawux.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/lepolotixokeboz.pdfIn PDF document text
    • https://sainaudit.mn/File/luzabisodiditiva.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/pedamametasawiz.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/17318437615.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a9db1ec3b---4868908361.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/48662734879.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/47129063567.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/gozenamunu.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/60824679504.pdfIn PDF document text
    • https://peperita.it/writable/public/userfiles/file/28992139154.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/41367140869.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/xetepodefad.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/4692987965.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/63211999938.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/99294838894.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/pakujoxapopizisewuzos.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/15130933221.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/24098495257.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/68510765022.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/nirubuvazoxogavelawe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=vr+otome+gamesPDF 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_off0000b483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB483 18076 bytes
SHA-256: 021d22d10bd42ee6cfecfad7725ddef3dcebd9400a17962364a44c6ab019189c
font_01_sfnt_off0000e275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE275 10176 bytes
SHA-256: bd22ee2f197ce278cf2dc8e98b9d9e51b1662e0caffe6f41f66294559b1761f8
font_02_sfnt_off0000f95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1