Malicious PDF — malware analysis report

Static analysis result for SHA-256 2917aab01fa782ab…

MALICIOUS

PDF

77.4 KB Created: 2021-09-18 00:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 40d4e40a7c4562ce33c25768a3544287 SHA-1: 8b69748c4ab60f3ba9ddc7e3ddffae3b53b34e11 SHA-256: 2917aab01fa782abaabed65eecc9f5201021f69d9ee8a29a9e8583b292640687
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://medvor.ru/uplcv?utm_term=pubg+download+karne+ka+app PDF link annotation
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/79925196097.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/tewigevijeke.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/modedizeborinedoxatesip.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/35669065857.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/zadivelubotewukob.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210905151021_579074188.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/32724141751.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/gibipikudumerijuvow.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/lusis.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/lusexif.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/40502580714.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/safaf.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/40802624050.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b40a67736---98984418940.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/zumugibonaxewamim.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1630956223.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135615533367---zisuwuwerezofugodebalane.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/63543381829.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/tetepil.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/55182636271.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/86115654328.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/zetowomegazuwid.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090607155673499.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/telavi.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_off0000c9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE204 10628 bytes
SHA-256: 620b0fcd4fffdae3a9d683bd2089878f52748045e3b098904ed7648843f86afa
font_02_sfnt_off0000fa0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0C 17576 bytes
SHA-256: 5d6dd4c7a29dbae42f2262ff41e7fd5c3b42438f7aaab4a8dc6a76b86db524af

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