Malicious PDF — malware analysis report

Static analysis result for SHA-256 a21ba61233d27af1…

MALICIOUS

PDF

80.5 KB Created: 2021-09-08 18:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1504cd056111f8dda125079d3d3fba2b SHA-1: ec455f1d61b7b5d442a314145e07e379e06af9a6 SHA-256: a21ba61233d27af11e4d1ca4cfc16d6cd807ce646f62f3c08341b30f3c5b79dd
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, including a link farm on disposable hosting, suggests a phishing or redirection attempt. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a malicious document designed to lead users to potentially harmful content.

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 http://lukinserv.hu/file/73527999906.pdf In PDF document text
    • http://pescepiana.eu/userfiles/files/60835394064.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/wufimojediver.pdfIn PDF document text
    • http://szwygs.com/upload/30760587619.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/munusaronusonofifas.pdfIn PDF document text
    • http://xsteelstock.com/d/files/jelikavesado.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/90145937310.pdfIn PDF document text
    • https://ip-pharma.net/data/files/suvujesipinar.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/555984466.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/vusuvetusubo.pdfIn PDF document text
    • http://web5gstore.com/Files/files/jagoxiwebuze.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/257804907.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/89444743072.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/duxefosonemitaboxex.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/perijune.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/16962316152.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613341bd2c579---86485976527.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/purelusotomoxifoxu.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dekimewulatesexu.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f95aa62dc---kogar.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/febexexiwot.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b6b6c87ba---biwororeb.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77056787809.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/siviweparogaminemivoxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=layers+of+epidermis+pdfPDF 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_off0000d8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D3 16952 bytes
SHA-256: 39cbca84e8093be6e6e204c24280b682a93f6aa4d35c8402ae666492017c0ee4
font_02_sfnt_off00011c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9E 10484 bytes
SHA-256: 1cae07306f8443be374102025a11eba45bd7309a360181784b22db4993251fa6