Malicious PDF — malware analysis report

Static analysis result for SHA-256 04e8820a2db542b9…

MALICIOUS

PDF

85.1 KB Created: 2021-03-30 02:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4b6fcb4dfde28c07b430574bdf9fed42 SHA-1: 1bd98adfb83eca3cdeedd5189b7e71cd47ed448e SHA-256: 04e8820a2db542b9a05393baabd07a0a0ba0fa0f254d971d121c390f2c7222fd
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/strik?utm_term=what+are+the+scientific+habits+of+mind PDF link annotation
    • https://zakikewamipuvew.weebly.com/uploads/1/3/4/2/134234925/7f009b0e8.pdfIn PDF document text
    • http://ruwaxidalemib.iblogger.org/convert_base64_to_blob_javascript.pdfIn PDF document text
    • https://zekilunadaxidub.weebly.com/uploads/1/3/4/6/134631079/57b659e0e41d.pdfIn PDF document text
    • http://pevojatinolotej.22web.org/vpn_master_ios_free.pdfIn PDF document text
    • https://navadajedu.weebly.com/uploads/1/3/4/6/134614390/7006830.pdfIn PDF document text
    • https://duxudalo.weebly.com/uploads/1/3/4/8/134866109/mejolalovo.pdfIn PDF document text
    • http://gufutaca1.xyz/19172162026ry9oa.pdfIn PDF document text
    • http://businessoutsourcing.org/kezukutozokoia055.pdfIn PDF document text
    • https://roninuvanajeg.weebly.com/uploads/1/3/1/3/131379749/jowupiba-moguk-pesuxeji-firedu.pdfIn PDF document text
    • http://runmasten.online/dd_3.5_illusionista77ii.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pegek/18422594842.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/xananadoj.pdfIn PDF document text
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_c77c665a42a94ab69a4be0343682c517.pdf?index=trueIn PDF document text
    • http://nolifixumo.rf.gd/grade_12_english_home_language_textbook.pdfIn PDF document text
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_8f318717e6004df3ad7b3ae66a76000c.pdf?index=trueIn PDF document text
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_4168621d7f824555b59a3f2bccc3761e.pdf?index=trueIn PDF document text
    • http://tomulan.rf.gd/10071615823.pdfIn PDF document text
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_aab732ab48374329800b8324aa81d669.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11071 5380 bytes
SHA-256: 554e457b224e32b3f660422c2f13c3ebf95da2462c1c5c195ee78f0c91582ab9
font_01_sfnt_off0001229c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229C 10720 bytes
SHA-256: 5e7630a7111dbcaef17f938bf083fd149dd4159364e95b4d2e5e342928647e38

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