Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bfe972de53ff368…

MALICIOUS

PDF

83.8 KB Created: 2021-09-14 08:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8d53b29b7b10e5bb6c66687f35fb3439 SHA-1: 4ee51c7f625bc07a3fb83740a83cb87d2494c270 SHA-256: 1bfe972de53ff368c0f5c716896049c5baca00498fb8ba6f4f0dee0c8cade601
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

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 http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/zakekovaj.pdf In PDF document text
    • http://varadimasszazs.hu/uploads/files/72648865313.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/woxuniduteranedeleji.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/93165758372.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16138e6c9372d2---nediwi.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210910150118.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16135ca2b408d6---68128856190.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/23126085845.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/notaf.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134025c8b04a---26331223082.pdfIn PDF document text
    • https://tekmaker.com/upload/files/pudevajedufulewit.pdfIn PDF document text
    • https://investir-petroleo.pt/ckfinder/userfiles/files/dasisotosi.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/85315407716.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/25196572254.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/50294042888.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/44865946075.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/9717044748.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/45809447609.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/nirife.pdfIn PDF document text
    • http://citranco.com/users/files/migababipetazebiveme.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/wajoxugu.pdfIn PDF document text
    • https://led7.ru/file/87432609648.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210905095136488201.pdfIn PDF document text
    • http://emeat.ru/var/files/72517864166.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/38048828902.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=best+offline+gps+app+androidPDF 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_off0000e67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE91 10728 bytes
SHA-256: 7c9ff91fcef668eb23bf431db9c5c3f585a17588f374948c9441b1331d278d17
font_02_sfnt_off00011721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11721 16372 bytes
SHA-256: 9d152aa379ed62c08b5e3ef84cabe2a7d1c9d3780586448ce1af147dfdc2c06c

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