Malicious PDF — malware analysis report

Static analysis result for SHA-256 42d934115088ed36…

MALICIOUS

PDF

67.2 KB Created: 2021-09-30 12:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 59a5f4a3b906121848a472ec972524b7 SHA-1: 5f6f5e43ab9b3610c636cb56150bdd44375d0057 SHA-256: 42d934115088ed36c08d5c5035ace7a1c1bcbaf86f90c1264ed70ead10e4c38f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. This script likely redirects the user to a link farm containing numerous other PDF files, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the large number of extracted URLs. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fe92d990c1d2ff0720195966353a6f5f/54644948936.pdf In PDF document text
    • https://myclubowners.com/userfiles/files/43007821101.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/tuxuwugekebatoravafedefo.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/20612581785.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/lawivenugavexujopapux.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/4509706178.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/49231484259.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/rukumalakugukiluzogofab.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/bekimukibazumumubuxev.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/zukud.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/36047683742.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090219575978.pdfIn PDF document text
    • http://beiks.info/public/file/97065554053.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/24499876983.pdfIn PDF document text
    • http://canadianrockies.info/files/file/muxatija.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/12881567050.pdfIn PDF document text
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/fifumavuladi.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/31598237345.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/72051874286.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/91856097038.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/nelegazefimud.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109130912218135.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=eve+online+apkPDF 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_off0000ac43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC43 10020 bytes
SHA-256: 57782d06d0ee8a65a4248009b8f295694c78234bb0c5cb01ee3a8964effe8235
font_01_sfnt_off0000c291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC291 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000daa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA3 14676 bytes
SHA-256: 29beb5e177fa597ed5285407f43700ff54954aac32370823db752b74fa95f17a

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