Malicious PDF — malware analysis report

Static analysis result for SHA-256 b95125f76e5d01ef…

MALICIOUS

PDF

79.7 KB Created: 2021-05-03 14:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9330292b431585eb617202e2eeb924af SHA-1: 1b72e1067d6afb4b3d8dd27c990541f7cdcef8c6 SHA-256: b95125f76e5d01ef067529deaa52282d28d08851e21df2b1fbd2a685065b9a20
186 Risk Score

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 0.9998

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://kuzutuzo.ru/strik?utm_term=research+methods+in+education+an+introduction+%25289th+edition%2529+pdf PDF link annotation
    • https://cdn.sqhk.co/miropefaneka/hbcicic/31617894401.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzifixe/jehghbA/85595694012.pdfIn PDF document text
    • https://cdn.sqhk.co/sokavuwoz/KhixjhC/aavesham_ajith_movie.pdfIn PDF document text
    • http://milesatel.mygamesonline.org/collections_in_java.pdfIn PDF document text
    • http://biwedujurar.mywebcommunity.org/29906893307.pdfIn PDF document text
    • http://ruxuzosok.mywebcommunity.org/83482204959.pdfIn PDF document text
    • http://midarujiwuvi.mygamesonline.org/42397027861.pdfIn PDF document text
    • https://cdn.sqhk.co/ranetixeba/gWghegd/gipopefenorutofaroru.pdfIn PDF document text
    • http://ketenimolupev.sportsontheweb.net/fisemunotefojunofi.pdfIn PDF document text
    • https://cdn.sqhk.co/fenogate/mPrvqqN/muvomevudapexuxesugariwod.pdfIn PDF document text
    • https://cdn.sqhk.co/zogowefu/Rjahijf/tawegirativejupi.pdfIn PDF document text
    • http://wewogokuwidu.mywebcommunity.org/tenofinolumez.pdfIn PDF document text
    • http://vodabutopidaru.getenjoyment.net/apc_rack_accessories.pdfIn PDF document text
    • http://jarowulizose.sportsontheweb.net/81256372893.pdfIn PDF document text
    • https://cdn.sqhk.co/gadowikuxe/XAihyhe/apple_valley_utah_weather_averages.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://07a970a6-a864-461d-ba0c-8deda34efc75.filesusr.com/ugd/b56c0d_517ac6b99cc642c8b704c02703723c08.pdf?index=trueIn PDF document text
    • https://a29d81ee-e589-4368-99bd-4e0be04eb4c0.filesusr.com/ugd/a89e6e_9a42c381cc6e42b38cf74dfabacddc66.pdf?index=trueIn PDF document text
    • https://7ed754b6-a209-4558-9281-0032c7ee8ade.filesusr.com/ugd/4329d7_8f2bbb2a1d594f749c64dad69419a722.pdf?index=trueIn PDF document text
    • https://38c64f87-0506-4925-a3a1-425743e24937.filesusr.com/ugd/386d45_a53356b7a0f24a8895d6fd6057dbd20a.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EC 5680 bytes
SHA-256: f9eb69cd78bfc2107253334f6c07bd4264c01baa0e8c2135cff4ccfea0b02833
font_01_sfnt_off00010d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D20 10692 bytes
SHA-256: 3577adcff09e039c780edbc4c9f717ffa4047ffe2ab8cf29f72c5f18dd39552c

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