Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f4085b1f4700015…

MALICIOUS

PDF

94.3 KB Created: 2021-09-18 22:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 273202e16d8500a7eda3d03e39281180 SHA-1: 858944a2e09644af2e490abf8a384e44973b9018 SHA-256: 6f4085b1f470001543d0082c73ace778a32d0effdded74d602aeecd06548998e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URLs, indicating a likely attempt to redirect users to malicious sites. The presence of JavaScript (T1059.007) and the nature of the URLs suggest a phishing or malware distribution campaign, consistent with a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=android+g%C3%BCncellemesini+geri+alma PDF link annotation
    • http://urs-certification.com/gais/image/file/57060163243.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/xikusenuba.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/91210252964.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/17980158269.pdfIn PDF document text
    • http://moneymaker-gold.de/files/34586010277.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/50587302643.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/datidazagarinetedupibuxa.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/19766070235.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/5282736280.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/wosatemufu.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/numalutame.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4435417859.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/kufajoravibekiluneb.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/40413839188.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/nexotofop.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132cc424293f---janame.pdfIn PDF document text
    • http://epmachine.ru/d/files/52719890150.pdfIn PDF document text
    • http://www.uds-myanmar.com/image/upload/File/44418650655.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/kojasubeveziwupinepi.pdfIn PDF document text
    • http://dytac.hk/userfiles/pupesakifaberid.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/jifaxosimanodugixoxere.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/7485283038.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/20502504302.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/lisuxisag.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_off00010b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3A 18412 bytes
SHA-256: 1e56301ae276667e970b881e05a38c3659d57ff28dc1101e47728546b8033f0c
font_01_sfnt_off000138a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000150b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150B8 10788 bytes
SHA-256: 89537d45a48f299d5903bfb804212defa878b77200cf90905c77541b121ea563