Malicious PDF — malware analysis report

Static analysis result for SHA-256 282b05fc768465d1…

MALICIOUS

PDF

87.5 KB Created: 2021-09-11 18:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e935c3b1091a9893b56ee4aab8704fc5 SHA-1: 2880d307eff8d19867a9d24849487af43a05f086 SHA-256: 282b05fc768465d16f752b4bdf36ee7c397993706724562af4ea60d989aff007
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and are used in link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://queure.ru/uplcv?utm_term=clean+master+pc+full+crack PDF link annotation
    • https://ldcpc.com/ckfinder/userfiles/files/66454813584.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/31055211832.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/zafoletodepixorutifopexo.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/napivizaxomenug.pdfIn PDF document text
    • http://upakuika.com/img/file/87069261942.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/f4dc24e47f9138cf5512c350180db066/rusufujujivewajez.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/54292276647.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/13272204230.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/47897886472.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/pigitudopola.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/wipipixuzisokumajizoxedil.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/84064612280.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/63296658880.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/newetigifufi.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f996524e08---delefamavezilosakad.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/10007509915.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/73698267334.pdfIn PDF document text
    • http://citranco.com/users/files/dekiju.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/41239573209.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/31310658136.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/fokogukutebirewi.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/vosajogimeronubu.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/69447962251.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_off0000f2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C1 17572 bytes
SHA-256: 96cef4f291fa0b66039ccb186fe879a43d08841caaf5d0f5a33d424eb142d1c9
font_01_sfnt_off00012003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12003 10652 bytes
SHA-256: 146860d332b83404b2b04560bf79e5ecdb8b705a4d63922a635ddb1512bf034a
font_02_sfnt_off0001386e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1386E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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