Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4375ff30571d8bf…

MALICIOUS

PDF

86.0 KB Created: 2021-04-07 00:28:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 659ee7760adc53303945ad89598089f4 SHA-1: 78a7c6ebc9f6805eeddc438d80b05f2556b98750 SHA-256: c4375ff30571d8bf90b11ab966167ad6770f1f70140574021b621a97f217b06a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' point towards an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/strik?utm_term=ocr+a+level+chemistry+2016+papers
    • https://bogekivusuwi.weebly.com/uploads/1/3/4/6/134604255/gizoxafumuj_midofaz_xixosubabokukig.pdf
    • http://accueilcmb.com/watson_molecular_biology_of_the_gene_6th_edition_downloado5cin.pdf
    • https://roparinupiw.weebly.com/uploads/1/3/5/3/135392621/vuxogabewufepi_lumokixel.pdf
    • http://xufuxenu.mypressonline.com/cfhtmltopdf_page_break.pdf
    • https://nizevamil.weebly.com/uploads/1/3/2/8/132814567/5814282dc.pdf
    • http://setafugeridol.scienceontheweb.net/66666906592.pdf
    • http://xatovapotogu.mywebcommunity.org/topics_in_algebra_herstein_solutions.pdf
    • https://jipafedi.weebly.com/uploads/1/3/0/8/130813136/7254133.pdf
    • http://paxabak.mypressonline.com/daxamewobuvobexaxa.pdf
    • https://cdn-cms.f-static.net/uploads/4455370/normal_605f9337d44f0.pdf
    • http://pafowitowa.medianewsonline.com/zumuxalizadozuwaziwulas.pdf
    • https://xonarupitowij.weebly.com/uploads/1/3/4/6/134617661/5907895.pdf
    • http://nageramuvepom.mywebcommunity.org/which_processor_is_best_in_i5.pdf
    • https://cdn-cms.f-static.net/uploads/4447267/normal_6018afc52086c.pdf
    • http://lubenoredeji.mypressonline.com/39041556445.pdf
    • http://luxibenuguk.getenjoyment.net/functions_of_construction_management.pdf
    • http://rimka.xyz/the_adoration_of_jenna_fox_audiobookeyfeb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://resilasijajatil.myartsonline.com/free_online_ocr_convert_scanned_to_word.pdf
    • http://nujilexulajuwup.atwebpages.com/68653599517.pdf
    • http://taguloxutenafol.myartsonline.com/livre_hammoudi_appareil_digestif.pdf
    • http://piwakitidi.onlinewebshop.net/budgetary_and_non_budgetary_control_techniques_in_management.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d02.bin
fc79f32bb1fb670441c8e8ecd5a2ce691f342caeaf293623ca548be51d78e52f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D02 5844 bytes
font_01_sfnt_off000120c6.bin
5681f0b30c3c9dd585957273e14dc37629b0d2d8609a20b0255826e60209b71a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120C6 11768 bytes

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