Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b3f427657b2fdc…

MALICIOUS

PDF

71.3 KB Created: 2021-09-13 17:33:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dc1a07c7bf8452c53c17e64e9047bf63 SHA-1: 271fa7623ef2e697043c110a47567462fcdf0290 SHA-256: b1b3f427657b2fdc9ac8547a28757b47c2f420e708f1edf7f1971739426770ae
134 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript, indicating an attempt to execute malicious code. The PDF also includes numerous external URIs, many of which point to potentially malicious PDF files, suggesting a link farm or distribution mechanism for further payloads. The presence of embedded JavaScript and external links strongly suggests an intent to download and execute additional malicious content or redirect the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16137421816f04---43698486321.pdf In PDF document text
    • https://namhunglogistic.vn/site/files/84441668877.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/74587247113.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/xebeperejunov.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/53978318569.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/4285498251.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/jejuxa.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/53870873215.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///fakodudaluwadupuju.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/72910601993.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/saxowuvusibipurolupip.pdfIn PDF document text
    • https://shivajigrihnirman.com/singhania/downloads/file/vagefogudetevufunixuxovaz.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/50369960169.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/30805237649.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613221e8d2aa4---53044367391.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/17695792657.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210907014858.pdfIn PDF document text
    • http://winso.tw/userfiles/file/risixamewamigajajubibipa.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/28800268111.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210901100050_cepn9m.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=dubbed+anime+downloadPDF 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_off0000b5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C4 16556 bytes
SHA-256: 0bfbbede062326b463fb195191fd5b2237ee6bcb88a961c4f6b8e199b8227a76
font_01_sfnt_off0000e0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF903 10372 bytes
SHA-256: 961efc553126416c88ecb89eec22015ac5045d6227f2de2df893e1c81e9c33d2

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