Malicious PDF — malware analysis report

Static analysis result for SHA-256 90bd79d89dc39776…

MALICIOUS

PDF

72.8 KB Created: 2021-02-26 21:19:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 01e54bdee624c0dad3eeca1aeaf895d6 SHA-1: 4c1e490f4c4a6f4d19f6f88d740f2c4567044bd3 SHA-256: 90bd79d89dc39776cde1e2f253a72a2d3e3292014b7c2108c9f1effa16dc78b9
126 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to 'piano exercise books for beginners pdf', aiming to trick users into clicking on the malicious links.

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://vilenefex.ru/wb?keyword=piano%20exercise%20books%20for%20beginners%20pdf PDF link annotation
    • http://pixunune.sportsontheweb.net/libro_geometria_analitica_dgeti_resuelto.pdfIn PDF document text
    • http://jiwapadenejeza.getenjoyment.net/kirufejowigikavasanu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365547/normal_5fe802c391939.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456398/normal_601f0edcd9b6b.pdfIn PDF document text
    • http://zipubezexupoka.mywebcommunity.org/2018_first_aid.pdfIn PDF document text
    • http://dazolovegom.mygamesonline.org/zowomuk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369494/normal_5febb0bf261bb.pdfIn PDF document text
    • http://lejunuzegakikuv.mypressonline.com/kezajugetafakisitar.pdfIn PDF document text
    • https://lukazerud.weebly.com/uploads/1/3/4/3/134343231/xilajemube.pdfIn PDF document text
    • http://gejesixave.scienceontheweb.net/83941293905.pdfIn PDF document text
    • https://wulilunize.weebly.com/uploads/1/3/1/0/131071037/243737.pdfIn PDF document text
    • https://wovuwujofisup.weebly.com/uploads/1/3/1/8/131856276/fisosegiwopemabit.pdfIn PDF document text
    • http://xariketixagat.mypressonline.com/dubefuposa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486200/normal_6018af5ec56fd.pdfIn PDF document text
    • https://wosapinilesodiw.weebly.com/uploads/1/3/5/3/135347506/juzofin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mamaliloseda.rf.gd/41639953718.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_off0000df50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF50 5564 bytes
SHA-256: b7dbd801d7405a01ea9a787ab281a437298454f5dfd5f940145ad5911addcbb4
font_01_sfnt_off0000f252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF252 10384 bytes
SHA-256: 46718d519fbe07448a7b6d1d2a49cfc5faeb4d817cca6da44907d2985f55a75a

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