Malicious PDF — malware analysis report

Static analysis result for SHA-256 04b41cf60024f022…

MALICIOUS

PDF

69.7 KB Created: 2021-09-10 14:37:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5cf6eedd39a901f204603dc29fc58458 SHA-1: bdfbe998960057dc5d8e2565352ef17df9c3e452 SHA-256: 04b41cf60024f022fc08cc707a17d4cf4715f5e3792c6a168d571061434446df
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. It contains embedded JavaScript and a large number of external URLs, many of which point to disposable domains. This indicates a phishing or malware distribution attempt, likely using the embedded JavaScript to facilitate the download of a second-stage payload or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://archism.ru/uplcv?utm_term=define+tethering+phone PDF link annotation
    • http://webmba.fr/client/logo/file/zesedatedelew.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/lotubixowonowok.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/mamakikebudiz.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/nulerojozapize.pdfIn PDF document text
    • https://norservis.info/files/files/vefogesufu.pdfIn PDF document text
    • https://natinsel.com/imagenes/file/nawodawel.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/watokawuni.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/sevumab.pdfIn PDF document text
    • http://www.520amis.com/upload/files/38757757280.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sekonegotitunilotofozefi.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///bikigovafe.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/bopetonuxowojakibudiwuwop.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/82576041234.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0f5278f878ce10035ef96503956dbf3f/70924979658.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210905111207654260.pdfIn PDF document text
    • https://bfull.ru/uploads/files/bemejapivarivoneri.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/xaraxajot.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/77589916198.pdfIn PDF document text
    • http://unseretochter.ch/images/file/82901867316.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/13506036182.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/nenetakil.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/14022182920.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134be7c30987---54273399059.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_off0000b4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFA 10260 bytes
SHA-256: 7eb192205377fdd220ce8bfa813bc86aa1016aa96631c6bfbe68658cef8bc9a6
font_02_sfnt_off0000e3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F4 14732 bytes
SHA-256: 75036d0c85d187de9b283d829fdb4237b83ff8ea575c6ef61e68ab9571ac84e4

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