Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ae45299988ad06…

MALICIOUS

PDF

77.1 KB Created: 2021-09-18 02:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bfbfe304a107c79a9ab5daa172664098 SHA-1: d0f09dfe85dbe4065f6ce73710b9a89ad8650067 SHA-256: 38ae45299988ad06b8ed09d73a5bd5f1447d2ed789d7dd6299b4d68655a3ef54
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest it's designed to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/wepizev.pdf In PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/161406d33793cc---melafefaxefapanatave.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/vogulamadulivikufekasevu.pdfIn PDF document text
    • http://jsdarvin.com/files/busilepupulekew.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210910031453.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/86677033661.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/29832884304.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/nukojiwitifejav.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/91711658246.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/wajepudaporititiso.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/wibevadipipiso.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/moxujajosudifitimerasi.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/29214074383.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/74315025974.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/momofalovusenab.pdfIn PDF document text
    • https://parc-hotel.info/file/nelasazawivimerebelose.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/6843465216.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/xawebagov.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/ludixinogezilalikawemix.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/68954646564.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/8799383822.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/91519620027.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/fijajekugodoniradekenofin.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/voguzalubeze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=update+project+android+studioPDF 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_off0000c798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC798 17808 bytes
SHA-256: 63d169c8592317cfac2b81d2410adea4854b8dc025b7bf5bc2261a497acf3141
font_01_sfnt_off0000f5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E4 10700 bytes
SHA-256: 182a48de76f57bd41949b4ca7a53af27f0555f0da46da6c74dbc7a3adda7bfd5
font_02_sfnt_off00010e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1