Malicious PDF — malware analysis report

Static analysis result for SHA-256 3468353ea1db6c1a…

MALICIOUS

PDF

81.9 KB Created: 2021-09-08 19:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fed4f4ce40c5bc8d20d4199bb12ed2d1 SHA-1: 80c95e5c2fa5eed1ce2e3b16d3e02fcded402610 SHA-256: 3468353ea1db6c1a61c0e09995c33b9efa2de4927984267b62092176dfa9e4ce
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, with high confidence. It contains embedded JavaScript, which is often used to redirect users to malicious sites or download further payloads. The PDF also exhibits characteristics of a link farm, suggesting an attempt to obscure the true destination of the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://unitjaya.com/contents/files/9567016130.pdf In PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/magaduzelelarujowaruzaxu.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/57862934007.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/gasuxa.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134d0fc41434---75723073576.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/90262831222.pdfIn PDF document text
    • http://sieuthibds.net/images/files/gabisudaku.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/besupefu.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/zomiwetifilepifebiluj.pdfIn PDF document text
    • http://kmsenior.org/file/files/74616978381.pdfIn PDF document text
    • https://duongthuy.net/userfiles/file/fedapezufidufefiranurogi.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/fe5d2b715a719049f319803a9378ff9e/4370177416.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/7379948820.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/pexivovumegejubirukufu.pdfIn PDF document text
    • http://synowka.pl/galeria/file/6025858324.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/58276539326.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/71799005754.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/juxulanefijorosefe.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/wepurupifedanimit.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/zuxirawowetoras.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/narekemadavuwezesu.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/digazeburagaraxip.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/simudawadidovasabin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=user+interface+in+operating+system+pdfPDF 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_off0000d774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD774 11040 bytes
SHA-256: ad9ffb8adf8ebc8b92ef20b4311f9a2702dc1067f3b89771ee59fc7e65a7f963
font_01_sfnt_off0000f0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001090f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090F 18432 bytes
SHA-256: fa4b40ca6f9b834b2d100dec96f0d81504c03794f87f7a5a937c12d199bd2cfa