Malicious PDF — malware analysis report

Static analysis result for SHA-256 409d9c65ea45c956…

MALICIOUS

PDF

79.3 KB Created: 2021-06-01 10:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1c00f92a710ce24b3974fd38f9cfa2af SHA-1: 1a6bf5d159e7e84807677809b86245467a60eff0 SHA-256: 409d9c65ea45c9566d9e91a8b5836a21366c2f3da5d505084ca31ce939ef552b
134 Risk Score
Tags
free-cdn-ebook-manual-lure

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 presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bologen.ru/123?utm_term=attendance+sheet+in+excel+sample PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475727/normal_6058b3c7c5c45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416514/normal_6066f00d27311.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370791/normal_6001775a2fc10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373016/normal_5fd3cc0f6db70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372100/normal_5fdc276f6540f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493553/normal_5fe30458b890f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418391/normal_60430b6eeab27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375070/normal_6058af51e4c4b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393647/normal_5ff76e58cd72b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449184/normal_600ce9e391546.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379477/normal_60394fed428ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464082/normal_601240d5f2dde.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499329/normal_600922c3f2afb.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/9455a42f-cc2b-432b-bd23-c2b3afb6e97b/roald_dahl_the_witches_book_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5da1ea7d-c04d-4e08-9cc4-f5bc2addb21c/how_do_i_reset_my_uconnect_4.3_dodge_journey.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/f/dufokusuwojuni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcf56c2f-9362-40ad-a40e-53afcdda3213/calculo_de_volumenes_con_integrales_triples.pdfIn PDF document text
    • http://kevuxezedila.pbworks.com/f/jogomowivir.pdfIn PDF document text
    • http://togusan.pbworks.com/f/car_driving_simulator_2020_ultimate_drift_mod_apk_unlimited_money.pdfIn PDF document text
    • http://jifesepapo.pbworks.com/w/file/fetch/144450309/how_to_take_megger_test_of_motor.pdfIn PDF document text
    • http://zikupuzajix.pbworks.com/f/barlow_and_durand_abnormal_psychology_8th_edition.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_off0000f964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF964 5272 bytes
SHA-256: 6e30f187463cf8e729938e0aa29c29f10c59027f9dda32febda5c37ce0882864
font_01_sfnt_off00010b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B35 10596 bytes
SHA-256: f897a41960721ef6ac47583229bc9252ef8af5549a2c50d50f7ed35a0d87fd67

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