Malicious PDF — malware analysis report

Static analysis result for SHA-256 6398415d55d175bd…

MALICIOUS

PDF

71.5 KB Created: 2021-09-11 13:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aae8cf00c106b3614275b448f812492f SHA-1: b3b5911c2753880428ce572641b4dab0b046df0c SHA-256: 6398415d55d175bd0bbfde9344fd48b65dada9f40229afd79381cc559a6aed77
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded JavaScript likely facilitates the redirection to the numerous external URLs found, which are characteristic of phishing or malware distribution schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://shahgrp.com/uploads/4675939150.pdf In PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315afe2b80e---garuzuwiboxurovi.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/gozamexisisebugenike.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/pofidoxivuzonasagilamese.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/43705181075.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/15576487851.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/vawadapipasofuruvev.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/8462214647.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/vereduxafelebakojex.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef97c191cb---66122370961.pdfIn PDF document text
    • https://hobbypet.cz/files/file/witipadurulosasifusovedig.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/tufokawalazafelexow.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/rekabefufuwedezu.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/lamafidovelowexilexobasa.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/mexowadalemibonopumazawo.pdfIn PDF document text
    • http://ort168.com/upload/ckeditor/files/vobudubomirawuduvupetanol.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/vekebefowadaguneve.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/47736972413.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/94032346672.pdfIn PDF document text
    • http://rinsacars.com/files/others/68560225851.pdfIn PDF document text
    • http://ibsdhc.hpds.work/ecdemo/web/js/ckfinder/files/files/waloxizagumisekadaje.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/42451668994.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=viber+android+wearPDF link annotation
    • https://forums.androidcentral.com/showthread.php?t=770444&s=b87137a3079db9b137da3079db9b1724b2b3d939In 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
    • https://forums.androidcentral.com/showthread.php?t=770444&s=b87137a3079db9b137da3079db9b1724b2b3d939In 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_off0000b879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB879 16160 bytes
SHA-256: 6e2818d87bc8198571b0973a8ef9e75efc028c7b6150086ce70ac64ac2c5cfdf
font_01_sfnt_off0000e231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE231 10124 bytes
SHA-256: aa7b3fb3919170eb0382a6c0b46597539bc29a67a55d7d3707480d4fdd21413f
font_02_sfnt_off0000f8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1