Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b039cdff55dfa9c…

MALICIOUS

PDF

82.2 KB Created: 2021-09-16 00:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 2b4f34087094d0676e474600bc05a9a7 SHA-1: e667db447cfa47b7d33b82d37d779cc74f755e56 SHA-256: 3b039cdff55dfa9c164b3db37d5c24ced2953fcbf6a77d919d9c08c9ac63cb8e
134 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.ishvani.com/www/js/ckfinder/userfiles/files/xunawufo.pdf In PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/9473792207.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/21406176165.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/mifesusegojodarofalevut.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/nimuwabazaj.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/nanuxabuzexete.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/xilufarev.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/bikerotebakobasasiw.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/fajovebedumewiruvavaw.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/5322779088.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/wanuro.pdfIn PDF document text
    • http://fedime.org/imagenes/jepanakijisuli.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/dekujemugeritenibugumob.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/78123414871.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/welokigepajixafekodewutuk.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/kalaseraxo.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/ziwerukomozanusadog.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/62529105867.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/lakulep.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/55719755616.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/zobomibogabu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=i+want+free+v+bucksPDF 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_off0000dae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE4 18528 bytes
SHA-256: 4ce5ece6bad0e9edf21830cb34da0e3c20643e86dcdcf8b8a282f25a47a0c3e0
font_01_sfnt_off00010b37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001234e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234E 10508 bytes
SHA-256: 813b3a65f43a21f338e3d1ec628c8d7c40ab0fc0df1838370a2cf0f95ce148d3

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