Malicious PDF — malware analysis report

Static analysis result for SHA-256 25ae9b99ea0c24fe…

MALICIOUS

PDF

80.1 KB Created: 2021-09-15 21:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4769f33243df3a963c52a0b61fb34e88 SHA-1: 381f6f9681866bcd0fc460c6f16a761a9ecdfd4e SHA-256: 25ae9b99ea0c24fe27d8fbce9f47a1a8429fccc2c6966ef280a3d51962b378ea
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and embedded links are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://tatvideo.ru/ckfinder/userfiles/files/26149824734.pdf In PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/jamoburisirume.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/28947533289.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/33127176585.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/rosapadakuweb.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/lebuvabojexogen.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134451fdb09c---24510593506.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/74325223312.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd365dd66f---jutilisa.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/73486053501.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/35287090252.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0709542001631577832.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/ruvapezineku.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/taxuzerin.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/43204273151.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210905074952_htz1xf.pdfIn PDF document text
    • https://digireg.es/upload/buwiwajenikuva.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/48034327459.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021091119051099050.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/6829313655.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/22619582828.pdfIn PDF document text
    • http://turchifiltri.com/userfiles/files/97558878842.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=boruto+ppsspp+isoPDF 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_off0000cd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD98 21004 bytes
SHA-256: 9229efbc2c68dda54d68ecf8adf9b477ca490cfe36a69c1aa70ea541ddb27ae1
font_01_sfnt_off00010476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10476 9956 bytes
SHA-256: 46ddee25bf0d8c0f91e4f288375b19954323d1d51f038229566e84f39ea864cb
font_02_sfnt_off00011aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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