Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e8672fb7f4b70ed…

MALICIOUS

PDF

75.3 KB Created: 2021-09-10 09:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4ce297f9e13d10e52d083b4c5dfb265a SHA-1: 9e8b6cc0eba5c81a9f2ab71c98139a0b8d17af69 SHA-256: 5e8672fb7f4b70ed1fa6f2557780096d04948ba882332d4a2460386aac54c6a5
86 Risk Score

Malware Insights

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

The sample is a PDF that contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm. The ML classifier strongly indicated maliciousness, and the PDF SEO Disposable Link Farm heuristic confirms the suspicious nature of the URLs. The document body is heavily obfuscated and unreadable, preventing further analysis of its specific content or intent beyond the URL-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://hangnhatbanonline.com/upload/files/gesibogaxesazugepovalu.pdf In PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/59722564767.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/17958060207.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a76ef616e9---mipaso.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/97756090361.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/kosapikuwavavidanujuz.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/50319811112.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/notevufugivuwij.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/napamulumaj.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/10284994623.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/nupumijobotife.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/19073092627.pdfIn PDF document text
    • https://mkontroll.hu/File/13527394951.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/jurunerizowulibalobisimi.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/jamomaziragugerirasobe.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/22988636955.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=serious+sam+1+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_off0000b9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C2 21188 bytes
SHA-256: 9c498d844cf8d599a8a72fd041b793af8266275e5452d871976ea02440fc368f
font_01_sfnt_off0000f048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF048 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001085f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085F 10492 bytes
SHA-256: 5e6ce247fd2c73e7d8b272fe15c0b3b9caec753af756d8cda77f6b52b6add052

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