Malicious PDF — malware analysis report

Static analysis result for SHA-256 20336c585c92a3ab…

MALICIOUS

PDF

79.6 KB Created: 2021-03-14 18:15:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d29df5f445b4ae176708e8d7f4fe7a3c SHA-1: 4fd7d41f91640d73ede249bbe6e53fe8e76da6f8 SHA-256: 20336c585c92a3ab87e20e7a136ef05b795dabe7a28d04d6d1309f8760369971
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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/wix?keyword=fiske+guide+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368221/normal_60418a1c476b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369183/normal_60334dec11f2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382405/normal_5fd976fed6fa2.pdfIn PDF document text
    • http://zotoxilob.getenjoyment.net/las_batallas_en_el_desierto_personajes_secundarios.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368492/normal_6009a491954e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455914/normal_6042c7be99f2d.pdfIn PDF document text
    • http://widonatozeg.mypressonline.com/what_happens_in_the_poem_remains.pdfIn PDF document text
    • http://patedeziw.mypressonline.com/pathophysiology_of_disease_lange_download.pdfIn PDF document text
    • http://kujunat.medianewsonline.com/74161383865.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489061/normal_5fe9e976c88e6.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/15198131474.pdfIn PDF document text
    • http://lemafesopeposuz.mywebcommunity.org/air_force_previous_paper.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483589/normal_604a196af2c45.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418570/normal_5fec0316b9119.pdfIn PDF document text
    • http://boxijogirexu.medianewsonline.com/guwegotodejusevozedaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vimixof.onlinewebshop.net/how_do_you_know_if_your_flame_sensor_is_bad.pdfIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_c325fb2cc7cd4848881c4c5972e8fa91.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb2f45b9-67f2-4490-9654-5475fb52a214/how_to_winterize_an_rv_with_air.pdfIn PDF document text
    • http://supajiwa.myartsonline.com/la_la_land_another_day_of_sun_piano_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45ccb348-ab91-4014-aae1-17e2269c3636/behavior_theory_in_health_promotion_practice_and_research_free.pdfIn PDF document text
    • https://6448a590-b571-4b71-a9e4-820b8531b153.filesusr.com/ugd/782be2_a184379b5d284647bd9f5c479aad0217.pdf?index=trueIn 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_off0000fbbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBD 4892 bytes
SHA-256: 60d042467e8b5a533280b5ff4b13cc08c9736bcb84ab20ad2e6dd4e3a1243c5b
font_01_sfnt_off00010c86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C86 10928 bytes
SHA-256: a77f8b6cd04003b935ef6fcae6bd07a83063781b7286741cc35506a1d11f900d

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