Malicious PDF — malware analysis report

Static analysis result for SHA-256 4905e7a8ce6399de…

MALICIOUS

PDF

79.8 KB Created: 2021-09-20 21:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2f6b7465e73ceb273572c7c25fa44a46 SHA-1: 4b8d9d84a8da0f8a686e2f44e289bcd5ba9843b1 SHA-256: 4905e7a8ce6399de2389910489de211bc9445c28803faa40dd4d0993d9d733b5
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many pointing to disposable domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to obfuscate the malicious links or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://pc75.net/upfiles/file/1631966681.pdf In PDF document text
    • http://nagakuratrading.com/js/upload/files/29660068065.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/sowoletevuwis.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/36575393553.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/10291121255.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/42312901888.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/mijatepot.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/57756354981.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/32246429598.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/xonuxexogufovim.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/99548991752.pdfIn PDF document text
    • http://crediramasrl.it/public/file/69965548043.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109030111131745.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/36616281934.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/vudinus.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/nopimum.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/xenivoxasatige.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/43380358435.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/kimoku.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/16763394655.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/serixazovazexigubumi.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/54600824189.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=apk+mobile+trackerPDF link annotation
    • 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_off0000d34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34A 10476 bytes
SHA-256: 758c120c12808b05886f9355e32ca0f505afca55bf65889a7933a601b6f3ac00
font_01_sfnt_off0000eae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE0 18136 bytes
SHA-256: 5cb56ea62461928456926c9766a415a6233e926607bfe93fa8e794108542fd43
font_02_sfnt_off00011a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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