Malicious PDF — malware analysis report

Static analysis result for SHA-256 afaede9735023ffc…

MALICIOUS

PDF

75.6 KB Created: 2021-03-25 09:57:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5c8fcf4c31673b7d713e524226ccaf3c SHA-1: 3a50e6441efd55c512567071b2cfcbb91324e397 SHA-256: afaede9735023ffc125eda538625969fa1a13c5f73ee5ab15a46b1c315a8a363
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://leonvi.ru/strik?utm_term=2011+chevy+equinox+2.4+engine+replacement+cost PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4500183/normal_603d301ac9c5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449974/normal_602220e6aa25c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372085/normal_6030286bd28ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475741/normal_602b8509d2160.pdfIn PDF document text
    • http://bifozitixexidad.mygamesonline.org/fall_risk_assessment_tool.pdfIn PDF document text
    • http://nupifijaw.getenjoyment.net/application_letter_for_scholarship_financial_assistance.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403410/normal_600c918f64f77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375705/normal_605137ed73f72.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://356bbf58-84af-4bff-99a9-d03346e46411.filesusr.com/ugd/b5472a_961967758e2e42de897d041c1ad3828d.pdf?index=trueIn PDF document text
    • http://wusozupit.myartsonline.com/belet.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/free_printable_multiplication_worksheets_for_2nd_grade.pdfIn PDF document text
    • https://5405d108-7f1e-482b-a10c-e06f62b7505d.filesusr.com/ugd/d941b1_684212b89006436bba38e65bdb4bb457.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/waxapoz/gimigodigo.pdfIn PDF document text
    • https://s3.amazonaws.com/wakuzidi/dell_inspiron_1545_restore_to_factory_settings_windows_7.pdfIn PDF document text
    • http://duvodix.myartsonline.com/long_john_silvers_menu_popcorn_shrimp.pdfIn PDF document text
    • http://ligiwekuxote.myartsonline.com/18148474028.pdfIn PDF document text
    • http://bexukavibume.myartsonline.com/bixler_2_user_manual.pdfIn PDF document text
    • https://8f1c0ae7-1ba6-4c51-a623-4d29f5e3aebb.filesusr.com/ugd/c1615c_fcaf5be195af4dc1b0d8fcf2ba40efbd.pdf?index=trueIn PDF document text
    • http://pitigapevede.onlinewebshop.net/cuanto_m2_tiene_un_metro_cuadrado.pdfIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/dell_latitude_e7450_i7_5th_generation_8gb_ram.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_off0000e939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE939 6052 bytes
SHA-256: 715a5340b74e11a6aa9f298bcfeb217bf5115d2fe8c52f0d1fe8f04b67c4e93b
font_01_sfnt_off0000fdd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD2 10288 bytes
SHA-256: a3add8851a31724dcbb112e192eb7f6236c61ac175f49a78a94395d96cf0db21

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