Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb9024ab535474f…

MALICIOUS

PDF

81.3 KB Created: 2021-09-22 16:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9d1eb5785a5b10bda196697d86fc038f SHA-1: f5ee7fd1f271e3f66ffde4952f210ae5819e94d9 SHA-256: dcb9024ab535474f1cda64f66621c4c97587142c29e6fa149b9c9de5d67b939d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files on various domains, suggesting a link farm or redirection mechanism. The presence of external URIs and the overall structure indicate an attempt to direct the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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.
  • 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://dintainoodle.com/uploads/files/witinijolezifuw.pdf In PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/vuvaxojozo.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/88433308492.pdfIn PDF document text
    • https://cian.hr/userfiles/file/bavasawukadubifiwiwajuboz.pdfIn PDF document text
    • https://tcremich.lu/files/files/74695804570.pdfIn PDF document text
    • https://istanajp.com/contents/files/rivosofosikipoked.pdfIn PDF document text
    • http://shendaoguoji.com/data/attachment/file/tokebaperu.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/72258991635.pdfIn PDF document text
    • https://defi128.com/userfiles/files/zokevumitogaba.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/57e01be5a6979bc685d1abaf9b53db44.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/39016133184.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///61521227106.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/40991170840.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/pomoro.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/rurizutinul.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451fcbdc2e8---bitev.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/18750803475.pdfIn PDF document text
    • http://vce34.ru/attachments/file/10041736225.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/nabebudimininiwavakejogu.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/77789701820.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/doloduxuvowukemok.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91978643046.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=romy+and+michele+watch+onlinePDF 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_off0000d8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10D 10612 bytes
SHA-256: cc3daad02d9265286bdd28c37f057119160a448a6cb51d4c022500b71241988c
font_02_sfnt_off00010927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10927 17844 bytes
SHA-256: fd9422a18e766fbbab117e01d330669b20e063cd42bed278a328a457bdac41b9

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