Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7bc02ef19cec2ff…

MALICIOUS

PDF

81.4 KB Created: 2021-09-19 16:12:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2a06f1aa084944d8290fdcd4f7547e43 SHA-1: 9ce112b0a8aa080161e75f06f3d31227c53ac879 SHA-256: e7bc02ef19cec2ff72f88b0497394497680af4015de41ad956b88f74d6ef3ddf
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

The sample was detected as malicious by ClamAV and an ML classifier, and heuristics indicate it is a lure for MFA or one-time code harvesting. The document likely aims to trick users into providing sensitive authentication information. Numerous unknown URLs were extracted, suggesting a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://theeultimatenetworker.com/ckfinder/userfiles/files/1342932506.pdf In PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/64147850795.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/koduketumibagujiluwa.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/28047407109.pdfIn PDF document text
    • http://rjt1.org/upload/files/38357286493.pdfIn PDF document text
    • http://teknis.it/userfiles/files/65589688129.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/95370326099.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/41596116820.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/fukenudotasozuraketoji.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/22268543257.pdfIn PDF document text
    • http://mweb.cz/images/file/90124218431.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/4776835835.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/11555652782.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/13456626482.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613745085d15f---25746795694.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/g5a2v8me4hf3le0o3eks492rg6/dumosusogelowoserelage.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/zivokilojone.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210909_051812.pdfIn PDF document text
    • http://www.puhito.hu/uploads/76576372817.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/sanekaketafizaxelogu.pdfIn PDF document text
    • http://cannamelis.com/userfiles/file/18874941551.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/55580490025.pdfIn PDF document text
    • http://precisao.org/files/files/wekef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=react+native+sms+listenerPDF 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_off0000d9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F9 17780 bytes
SHA-256: c64d8a6866b53219b7ba9f14c203ecbfda7a903f7da6be48d9cda0d199a5f005
font_01_sfnt_off00010854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10854 10384 bytes
SHA-256: adaa88c72078fb87dcb7f0e48fc8b65eb40186c66bb0e1b6a15411dfc03ec618
font_02_sfnt_off00011fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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