Malicious PDF — malware analysis report

Static analysis result for SHA-256 7104850552d7c50e…

MALICIOUS

PDF

78.8 KB Created: 2021-10-08 22:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 806f1b7a4295f4e697e5d7305cc59b23 SHA-1: ceeed835a15a84d99e8c7d840b72f4736fac3191 SHA-256: 7104850552d7c50e778df440d226fc80a17666a5d63888154085f914bb6a1675
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://archism.ru/uplcv?utm_term=how+to+pronounce+joppa+in+the+bible PDF link annotation
    • https://rezilta.com/psum/admin/userfiles/file/53435730673.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/64017767207.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/wojosigudusifuxeni.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/donafefezuru.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/853e946401d7ca35d10b58d02eb71a99/wewomid.pdfIn PDF document text
    • http://insei.eu/userfiles/files/tavilidadomiwug.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/7022239540.pdfIn PDF document text
    • http://xn--c1adbeke4asdefy.xn--p1ai/ckfinder/userfiles/files/29323950618.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/voxixebajal.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/17794938273.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/68910102344.pdfIn PDF document text
    • http://allier-genealogie.org/File:/mumovuvegevatiwetal.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/56315138332.pdfIn PDF document text
    • http://eva.am/files/6811dd40d132c0a4.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/49139529896.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/juzuvasibirumumigolu.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/puzasejivef.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/bodewojovikif.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/puvilomewexalax.pdfIn PDF document text
    • http://rentator.com/uploades/fckeditorfile/73992130508.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/duleropoxej.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/jupedopak.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/3842943043.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/nosiwolen.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/22855216844.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cac17dacc---rumatileki.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_off0000cb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6D 18716 bytes
SHA-256: 1c56aa50ef78a513feef058d07b166222f74af5102fd0b76e0cdcf8720bb9bb0
font_01_sfnt_off0000fc81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC81 10752 bytes
SHA-256: e4492a5238da667874f05d510bebf830c755200a1487278b7d376b4d96ee731d
font_02_sfnt_off000114e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1