Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5ac67ab766810b0…

MALICIOUS

PDF

76.8 KB Created: 2021-09-13 21:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bd865929516cae14215e174ffdc5ca41 SHA-1: 1fa46f8e39f37c4fd12ca29c3479b2d8186e9152 SHA-256: c5ac67ab766810b055aba456dd418bba956339f74d767294eb1da94aed3c281f
126 Risk Score

Malware Insights

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

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://highdesertrent.com/newsite/images/uploads/file/wetav.pdf In PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/0287c21249ded59148d8d0e46f4ed223/pukulegaduvegowusasakit.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/6138a5086aea0.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/nirakuvejupajolub.pdfIn PDF document text
    • https://playworkspartnership.ca/sites/default/files/file/lenewukexisuwiluladejepud.pdfIn PDF document text
    • https://hirurgija.me/files/20390313626.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613e486adc0ee---malivatojonibumaxedujaras.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/pojukedidapanezulaja.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/61394618159.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/66278704049.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138400b071b3---38636441526.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/23519673146.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/56657119220.pdfIn PDF document text
    • http://www.catedralirodahaz.hu/data/editorfile/xixiladoreg.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/44425841400.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/36681498854.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/49516410497.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///32262054392.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/mawabevi.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/sevuloxowisixepajisu.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/39423289006.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210908221136687.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/14134247937.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/senakebepisigemurunigofi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=stick+war+3+hacked+unblockedPDF 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_off0000c96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE180 16616 bytes
SHA-256: 425f402fe2f564203bc27447cd689eb4b68f929c085a8537de66cb4985a35eb9
font_02_sfnt_off00010ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA5 10964 bytes
SHA-256: 71b76c0b5011de80fea3d9df2c7d856caa2f281d1825ea66497dce36c2afcb0e