Malicious PDF — malware analysis report

Static analysis result for SHA-256 955b3d5f0e60f45e…

MALICIOUS

PDF

82.0 KB Created: 2021-09-17 22:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7339f7524b1f4a57fccaa802f5871a83 SHA-1: fe26ff80eca732b41f288637b99559cf256dfe01 SHA-256: 955b3d5f0e60f45e029eb5068bc41f41468cc4dc950d4194a829710cbe97b1eb
146 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to external websites, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates the document's structure is designed to host many links on low-reputation domains. The presence of multiple external URIs and the overall structure strongly suggest a phishing attack aimed at redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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 https://queure.ru/uplcv?utm_term=airplay+for+android+tv+apk PDF link annotation
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/68322068511.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/finujepolagemasuxerag.pdfIn PDF document text
    • http://sport-zavora.cz/data/file/fufegamejoj.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/38819585593.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/verobiwojomodo.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/garaminixikurififafep.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/zuwava.pdfIn PDF document text
    • http://tchid.net/userfiles/file/lowimat.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/7c25541b2630c115e09d8fabab4702aa/sawuxarepaviwogem.pdfIn PDF document text
    • http://reichspfarrer.sk/file/vobewipef.pdfIn PDF document text
    • https://12waktu.com/contents/files/budewesokovajava.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/33919767506.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/25256448286.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/vizakizib.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/10335412979.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/tememaxa.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/fegagilenawekez.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/59069166242.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/zugepetoluledegitok.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613eec38de2e3---goxiwiv.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/gosejupixokawomupofi.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/52462198232.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/31952393227.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/pagowi.pdfIn PDF document text
    • 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_off0000da2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2C 10444 bytes
SHA-256: 38df5f65d6c9c141e9a95401889e73aaacfaee02ed1e76821db7a14c9934a91f
font_01_sfnt_off0000f1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A11 18580 bytes
SHA-256: aa6b50fd1a8508a558679fb46a24db37e22abea287ba6af2cde59a27da261e6d