Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba5da43544ffc3d3…

MALICIOUS

PDF

71.0 KB Created: 2021-09-19 15:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c7efcb1c100d0f4f8253435758357b3a SHA-1: 5ad023079a909b2898d64a78d2318f33c80d6f71 SHA-256: ba5da43544ffc3d3b74654b4697806e7f962a183b26696c9931083503f6f88f9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to suspicious domains and structured as link farms, suggests an attempt to redirect users to phishing or malware-hosting sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://universal4shipping.net/userfiles/file/86620492746.pdf In PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/liguxiwap.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/79468838481.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/17421620106.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/96446578829.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/xupubejasigupeju.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210905_4A4F0F7DE0216DF5.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db67ecd958---xodivavi.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/3406003131.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/dikagorimu.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/waxusosedipuno.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/joxesowufuseretevaz.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/visizekot.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/fumoxuxosed.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/sudusewefezo.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/gupupekajubobuwap.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/12068300586.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/wejajekarasalago.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96714499158.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/36277697761.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/pewufogufovizufudude.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/kemabedo.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/89554469174.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/31627783721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=where+is+a+clipboard+on+a+phonePDF 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_off0000b70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB70C 10648 bytes
SHA-256: e3c51b8ef49bae78f5e14f3cc2eebc3e2ad9352c6779c7362da00488666dd911
font_01_sfnt_off0000cf1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1B 15400 bytes
SHA-256: 0b55f320eb98ff9f4d72023e7971d3e748255820eeda4907577f5fe34b27c67b
font_02_sfnt_off0000f600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF600 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1