Malicious PDF — malware analysis report

Static analysis result for SHA-256 e506541a191e0a04…

MALICIOUS

PDF

84.9 KB Created: 2021-04-15 17:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b609f053ec2cb77ead30af72db0e9746 SHA-1: 5b6aafe513ed50ab1b35940821a29f3364de2cd7 SHA-256: e506541a191e0a04404a7222c4d053af098c8a945705f51ca0324e963f16e132
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://nipisod.ru/strik?utm_term=old+school+music+list+60%2527s PDF link annotation
    • https://cdn.sqhk.co/mepetiruzi/wNShdig/tokeziforakufobi.pdfIn PDF document text
    • http://ginisuna.iblogger.org/appreciation_letter_samples.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449774/normal_60481e128a214.pdfIn PDF document text
    • https://cdn.sqhk.co/bipuzojafa/tjjhiaE/xupipip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384295/normal_603e36b714199.pdfIn PDF document text
    • https://cdn.sqhk.co/konanetufuda/ignYhcd/good_video_editing_app_for_tiktok.pdfIn PDF document text
    • http://sokegex.mywebcommunity.org/75179650017.pdfIn PDF document text
    • http://nizewapujapoj.22web.org/data_analytics_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471240/normal_6046e699ab71e.pdfIn PDF document text
    • https://cdn.sqhk.co/nikajovefer/hSCIhjJ/download_beach_buggy_racing_2_mod_apk_home.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/hapP4qV/80302145098.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421641/normal_601ec94c41741.pdfIn PDF document text
    • http://kozidozilujivox.getenjoyment.net/what_are_jobs_daughters_names.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/afcd84df-5c44-494f-8911-616c77a929b4/nocturama_annie_baker_monologue.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79d8877f-dd55-4c2f-8a58-7c31b4b1b08f/5994397874.pdfIn PDF document text
    • http://najiniroxow.rf.gd/25114387030.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/636de337-a29b-401b-b4dd-fb6cb0dfeb35/how_to_repair_ac_compressor_clutch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a2ace5f-70c8-4733-9190-ecdcd93dab3f/8647904750.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db3a88b4-fdb9-42fc-87d6-ba90908637dc/pbis_lesson_plans_middle_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61f1bb61-a90d-451d-a02e-524ad395c9fa/guzemuwetabetewibedig.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_off00010e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E77 5228 bytes
SHA-256: 003b62e27b5e5ba63f250032489aa15f6094254e7415b00d30dc6859fb7965fe
font_01_sfnt_off0001201e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201E 11184 bytes
SHA-256: fa882069e08237fe98cca6f7db7aff713e47f2e08a596fcf64541c0ed24da47f

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