Malicious PDF — malware analysis report

Static analysis result for SHA-256 2345859f90bfa08d…

MALICIOUS

PDF

81.1 KB Created: 2021-09-23 03:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0899b48fe7ef01859f4312fceffe2d12 SHA-1: d61583ed58bb694e979fd63cf52ae733ebfc2800 SHA-256: 2345859f90bfa08d621b44ad3a9a2121e3caf04543c5201c78640345313f7b84
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports that the PDF is part of a link farm hosted on disposable domains, commonly used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://garglob.ru/uplcv?utm_term=android+word+read+only PDF link annotation
    • http://yizhu580.com/ckfinder/userfiles/files/23982790509.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614855481056d---kasunizo.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/11715921396.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/pozizeroparur.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/75162430924.pdfIn PDF document text
    • http://cke.hk/userfiles/puwawiziwumesepepabu.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/86221956569.pdfIn PDF document text
    • http://finance-bulldog.cz/UserFiles/File/lijozezogosinikesavo.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/sonenatenotalifonud.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/goraxilegapawalizowixa.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109111959444881.pdfIn PDF document text
    • http://sro52.ru/uploads/files/90940803169.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/kumalesaxesavanokirog.pdfIn PDF document text
    • http://bastola.org/userfiles/file/lewibetuxipenaxuviwox.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/29110889956.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/losalebekifexekubedetadow.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/30376952284.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/nujezaxikexuz.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/96710024109.pdfIn PDF document text
    • http://snft.ro/media/file/bameja.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/linuxolomizaxegobo.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/linebibud.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_off0000d745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD745 18568 bytes
SHA-256: e44bcafb3ab73d611ffd1de120873c7208bfb9bc06a04ba7e0cc8cbf6b2428f8
font_01_sfnt_off0001084a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084A 10156 bytes
SHA-256: 039e68e63f8bec5fb128e525599797c9c9cbc6fdcf854bfeb135d2702ea328a3
font_02_sfnt_off00011f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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