Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d178d03230e7e40…

MALICIOUS

PDF

72.0 KB Created: 2021-09-18 10:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c95bf039705c1f32ed5afcb97ba674df SHA-1: 0a7fdfba01633dcafa3ff69ad0cbf388967e587f SHA-256: 7d178d03230e7e4073ce37891a1628dc95d934a2e0c1d6a323bfae50d21eabcd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous URLs, many of which are part of a link farm hosted on disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript action suggests an attempt to execute code or redirect the user to one of the listed malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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=apk+marvel+realm+of+champions PDF link annotation
    • http://pacemakerpressintl.com/uploads/assets/file/4270890339.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/68088541217.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/d31df6fe33fe0a659b75c29690791cfa/20228619688.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/35426779430.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/gijujizur.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/1524907271.pdfIn PDF document text
    • http://elitk.ru/_files/lopozexezigeroz.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/wemer.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/zazugad.pdfIn PDF document text
    • http://finchamauto.com/pics/xesijukazusoraxoleda.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/54573794629.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/fukakure.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/30316749475.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/23049335641.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/2c169861a5786d13ad739e1276723ee2/68324937980.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1631728177.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/65128855337.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/84535550905.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/83263392999.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/15108380897.pdfIn PDF document text
    • http://totoumi.jp/upload/file/belozijonezivojuxigonelu.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/kofokedasetedabuluj.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/86288649548.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_off0000b679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB679 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE90 10788 bytes
SHA-256: 0409a44dfdc32870ef6e4d24597cfc125860cd58da8b89b4a29336c55eb72665
font_02_sfnt_off0000e73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73B 16764 bytes
SHA-256: 3b919b43af44642ead98ae28a4454325f2742a35682f5cf1ac7a3b1304414ac7

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