Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c3984ba6af725b…

MALICIOUS

PDF

75.3 KB Created: 2021-01-02 21:15:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 234f4a288782646127e35fe057871850 SHA-1: f8f12a9e67c32a8c90f94033089a4c58ee5c7a8d SHA-256: 31c3984ba6af725b35e36ec51a6ed8652c63543d10d55343aa0f9a19864f167b
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffking.ru/123?utm_term=unturned+alice+pack+id In PDF document text
    • https://cdn.sqhk.co/bofogarabu/oghvhfZ/84187455884.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421058/normal_5f9ceb3ab1461.pdfIn PDF document text
    • https://xogosikeduvad.weebly.com/uploads/1/3/4/6/134669078/kuzopiterazufe-zutedox-dugubosef-renig.pdfIn PDF document text
    • https://kuvinonufero.weebly.com/uploads/1/3/4/3/134307364/terojuxet.pdfIn PDF document text
    • https://xesinuvukuwufo.weebly.com/uploads/1/3/0/7/130776104/dogevowerewitun.pdfIn PDF document text
    • https://cdn.sqhk.co/rilixuzewiv/jhj7hgk/pixel_game_maker_download_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a2142c3-5d5a-40b1-83c3-85fbf864c43f/bulozokogo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab12245a-4541-4e83-8cb8-dd41117b880a/kimam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90af5b86-c6c9-487d-9080-b8bb39eb1941/partes_por_millon_unidades.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/794f2bfa-a466-47ea-90c1-29652f0b4996/72324469532.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92174579-7a40-45fd-acb1-2c4bfeb8802f/suwem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47415e16-c69e-4fe5-b02c-73c7944c708e/definicion_de_talento_humano_segun_autores.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e01f46f7-8057-494b-8cd3-d99089cef177/26989178070.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44846309-993c-4b00-9dec-1a671328928e/azure_hybrid_benefit_discount.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68121406-bce0-4c0f-a589-e68bb4e1e8cf/snakehead_fish_north_florida.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://scripts.sil.org/OFLIn 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_off0000d45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45D 4944 bytes
SHA-256: 3fa88d180714aa5f59855a3ae093316e1e8a723f7cd54f8ed35810c8cc15b8d9
font_01_sfnt_off0000e545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE545 10328 bytes
SHA-256: ae8c74ccf9528fda3bafeaec7e0c79c8048f22b6358922d335d1660c4a13e9c4
font_02_sfnt_off000108ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108ED 16336 bytes
SHA-256: 25256c2198e1ea99b4240f94371e5cd2c502a53932f104c167df3a3ae5ae6342

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