Malicious PDF — malware analysis report

Static analysis result for SHA-256 3190e20b5811bdc4…

MALICIOUS

PDF

79.9 KB Created: 2021-03-25 09:46:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7d66c0fea08c0c15903cf084da9176fa SHA-1: 12e2efab7ddbb58a03e214444fc8d346004ad462 SHA-256: 3190e20b5811bdc4eb746ce22a3003a40174130756d9b04edf73f80731b2d5ea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://seumenha.ru/award?keyword=bridge+rectification+pdf PDF link annotation
    • https://ruwatavefi.weebly.com/uploads/1/3/4/7/134704280/gumuvumimejosidu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457560/normal_604392207f247.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414331/normal_603e5cba489de.pdfIn PDF document text
    • https://kunoloxudiruk.weebly.com/uploads/1/3/4/7/134767428/d536ec.pdfIn PDF document text
    • https://gidupewurugi.weebly.com/uploads/1/3/1/6/131637306/foxirubewezula.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413244/normal_604e16f0e8d5b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419828/normal_5ff9a7b6c5a5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490519/normal_5fd8b7eb68313.pdfIn PDF document text
    • https://vadiduriku.weebly.com/uploads/1/3/4/4/134445950/2593637.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406454/normal_5ff9c75d39130.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459922/normal_5ffd66a0df61f.pdfIn PDF document text
    • http://sawezudo.iblogger.org/rinnai_ruc98in_ultra_series_concentric_twin_pipe_installation.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/8a32d390-367e-4df7-9f7e-7bdb789d8f07/nonviolent_communication_a_language_of_life.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b93b8fe7-67aa-4ca5-9e76-09db0d8906ee/pt-d400_vs_pt-d210.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91a1b1ec-9fbc-4c16-aef2-67ac3bf75fd4/is_a_simple_favor_cast.pdfIn PDF document text
    • http://fifusudevop.rf.gd/cadbury_dairy_milk_product_information.pdfIn PDF document text
    • http://bavipilebevim.epizy.com/gold_guidelines_for_treatment_of_copd_exacerbation.pdfIn PDF document text
    • http://dimesagir.epizy.com/59750912382.pdfIn PDF document text
    • http://xumametubedax.rf.gd/wumikipasikoretokizexavuv.pdfIn PDF document text
    • https://9907981b-0bc7-4fd3-a434-169f7cdadf42.filesusr.com/ugd/575363_d338932c8f784e7ea8aa31b5bc857368.pdf?index=trueIn PDF document text
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_73f2f38499a04b0fae169de3941242a0.pdf?index=trueIn PDF document text
    • https://a32e93c2-1aa3-4149-af29-aa5d163ab988.filesusr.com/ugd/40336e_5495cf87916547d7add19f8241cca300.pdf?index=trueIn PDF document text
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_648823e8e2754e9c9efe46513c119af2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5515cac8-bcad-454f-88f8-1ea1a7a425fa/pavupinaxibozetafenoxom.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D5 5160 bytes
SHA-256: bc7c548f9a0e92c48d6c23d53b1c995d8498f3ec523e06817c66a042252d32ee
font_01_sfnt_off00010b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7E 11448 bytes
SHA-256: f44131b77c4a5bea7447b3ef1b35e711f040fd6834e2c68574cdd277adf82f4a