Malicious PDF — malware analysis report

Static analysis result for SHA-256 36ceeb65e11e1aab…

MALICIOUS

PDF

71.4 KB Created: 2021-09-12 03:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f40f7c3a79999fe4743ca956e7c12ab7 SHA-1: 92f6c28f52c5615ba7f57d0e60a9d158bef63f63 SHA-256: 36ceeb65e11e1aab899cb3538209a415cad8e483d3d18b712340564b4806e624
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URIs, many of which point to disposable hosting and appear to be part of a link farm designed to redirect users. The presence of multiple PDF_URI heuristics and the ML_NYX_PDF_MALICIOUS firing strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/80602110544.pdf In PDF document text
    • http://poultech.net/d/files/gigunipopezukuwigopuso.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/85888158509.pdfIn PDF document text
    • http://apcmagon.com/userfiles/17709101531.pdfIn PDF document text
    • http://nadafashionbelt.com/Uploads/file/56887024172.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1cd741e14---39432270155.pdfIn PDF document text
    • http://regcureguide.com/files/files/jetedesazawukozuvok.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/34674199899.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16306562795774.pdfIn PDF document text
    • https://mcsfood.com/images/file/saruzabufebiroxe.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/93889260980.pdfIn PDF document text
    • http://litroshaber.net/resimler/files/redolutof.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/58387918486.pdfIn PDF document text
    • https://penal-garazh.ru/files/29558744512.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/koxorofebedemuk.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/nelogotikugariwipe.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/kufekulap.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/xiwagenoje.pdfIn PDF document text
    • http://le383.com/uploads/files/laraxi.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/12703477333.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16139088c37138---34481521615.pdfPDF link annotation
    • https://guijek.com/userfiles/file/bujepoposoluwiroroxi.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/64771747832.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/05ot6f94q5dtkcimr517jg9ava/43982341436.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=apk+geometry+dash+fullPDF 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_off0000b331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB331 11036 bytes
SHA-256: a4b055e917b1a8aa9416400bdad9dbd2d223adf120a56643417d7a67e60a4509
font_01_sfnt_off0000ccc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC3 17040 bytes
SHA-256: a738aea16f884cfb42dd98d3650f802c0de00406d30a93f03bc62553c8f2e1de
font_02_sfnt_off0000f84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1