Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b607183157f4f2…

MALICIOUS

PDF

79.6 KB Created: 2021-03-22 12:03:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 15c64f9e0ebbbe25108e04adb7d00288 SHA-1: 108d5792b890ee0826df248884955c7c5dded277 SHA-256: a5b607183157f4f2c9a7381e3d045cbfc9f27d275ce29b57de239b97cb37c755
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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
  • 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://baarspo.ru/strik?utm_term=define+phantom+limb+in+medical+terms PDF link annotation
    • http://healthyforczechrepublic.site/gardners_art_through_the_ages_4th_edition_free_downloadajw1r.pdfIn PDF document text
    • http://zagejudivavi.sportsontheweb.net/conversations_with_god_movie_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450418/normal_5fe1a8d7d15d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489850/normal_6041d21a0474f.pdfIn PDF document text
    • http://jolixasij.sportsontheweb.net/pioneer_avic-5100nex_backup_camera.pdfIn PDF document text
    • http://ramuwesitavoz.mywebcommunity.org/biographie_alphonse_de_lamartine.pdfIn PDF document text
    • http://pesuloduf.medianewsonline.com/ferien_baden_wrttemberg_2020.pdfIn PDF document text
    • http://dalifajebuxog.scienceontheweb.net/introduction_to_phonetics_and_phonology_from_concepts_to_transcription.pdfIn PDF document text
    • http://susekilimu.medianewsonline.com/10067181057.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369152/normal_60537ab0e0bcd.pdfIn PDF document text
    • http://vitalia-transports.com/doxezagatupetdirud.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/acae8c7c-a1d3-4c8a-a96f-ea74dfb997d1/the_alienist_season_1_episode_9_recap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a9d888e-4f4d-4fb8-85c1-fd6e07272067/chicco_keyfit_30_weight_without_base.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d89183e-239b-4095-a2ca-b52d32ce6852/bebefulopo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/922781d3-2a3e-424d-8151-3ecf132035fe/digital_design_5th_edition_solution_manual_free_download.pdfIn PDF document text
    • http://liduvitulugug.onlinewebshop.net/60947740497.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/638814f8-f02a-40b4-8ceb-6b1233049772/wabifobapalexafesig.pdfIn PDF document text
    • http://nabenejajoko.myartsonline.com/65482969952.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_off0000f929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF929 5532 bytes
SHA-256: 4fdb0cb8d4e10d743558c9e2d0dd42a7b40fe6133bcaa2ccb1867609aa650a34
font_01_sfnt_off00010bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCB 10976 bytes
SHA-256: 1249dacaa8bea382aaea3aee87fffd9f96b41d0a71c4c64fbea7df934e82578f

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