Malicious PDF — malware analysis report

Static analysis result for SHA-256 0358667278affb23…

MALICIOUS

PDF

69.6 KB Created: 2021-09-22 13:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0a6521e311a2c0d41dcd48a8fd181680 SHA-1: 79423c70fb4b6a99f47120327e5c0548b157903c SHA-256: 0358667278affb23b407a6e8418958a37d288eb1bf84e35d6f930cc6e4086d28
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, indicating an attempt to execute malicious code upon opening. The presence of numerous external URIs, many pointing to potentially disposable domains and flagged as a link farm, suggests a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://domainecomps.com/documents/files/6318347608.pdf In PDF document text
    • http://vetportonaccio.it/userfiles/files/tamutikifawinuve.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/64106556328.pdfIn PDF document text
    • https://suncables.co/images/file/fubudetuwevamegujed.pdfIn PDF document text
    • http://bivalyracing.hu/files/file/10907814818.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/67732084014.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/wirofulosinatatoxo.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210915_020506.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/reloputebonugejaweketuzeg.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/wolezetenigubotona.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/xibukevifuwedun.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/85196776866.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/gomeralabitijusonenovozav.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/63766063234.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/6d7006e372d6e677a0cf0b3aaac4b0fa/nanikalidapapil.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/74078121200.pdfIn PDF document text
    • http://crediramasrl.it/public/file/3055832945.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/beninoleluzorus.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/mazatokofijo.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/gepuberinof.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/miforeritibogapowudesume.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/99786827333.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=mandalorian+free+onlinePDF 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_off0000b303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB303 10076 bytes
SHA-256: 7f64c5a0704891169547e10c673c04d1bea8250e2b2fe8c900ac6da2bf9ae426
font_01_sfnt_off0000c96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE181 15548 bytes
SHA-256: 8b95327b5dd88655d4e8a2904efa0141c49ed7beebf6b35757dc31f3abeb61fa

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