Malicious PDF — malware analysis report

Static analysis result for SHA-256 da2c4be1098a6efd…

MALICIOUS

PDF

79.2 KB Created: 2021-02-20 16:11:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5a727f31d1a955fcbf0730aa34d33594 SHA-1: 44effad32332922ea2c5c571637a0e8ca462be37 SHA-256: da2c4be1098a6efd3421eefdf596c6fbae96261c248dfd03bfa978ca44c14904
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a significant number of external links, many hosted on disposable domains, characteristic of a link farm used to redirect users to potentially malicious sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest this document is designed to facilitate phishing or malware distribution.

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://baarspo.ru/aws?utm_term=f+distribution+table+alpha+0.05 PDF link annotation
    • https://cdn.sqhk.co/xojelumegasi/aSDyUvP/vikozedemuwakuzabogabos.pdfIn PDF document text
    • https://vuzowukuz.weebly.com/uploads/1/3/0/8/130814197/4266808.pdfIn PDF document text
    • https://cdn.sqhk.co/midipijikami/aghggY2/domino_s_pizza_near_me_menu_prices.pdfIn PDF document text
    • https://tuduzijusesuzi.weebly.com/uploads/1/3/1/4/131406801/27451.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455660/normal_5fd63255cf977.pdfIn PDF document text
    • https://cdn.sqhk.co/zegofurop/fifhhQ4/sasabepajaxilajixude.pdfIn PDF document text
    • https://wufodosutitivo.weebly.com/uploads/1/3/0/7/130739718/18300155755.pdfIn PDF document text
    • https://cdn.sqhk.co/wedegetuso/g33hcN4/xprevious_game_maker_studio.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366008/normal_60180a242216a.pdfIn PDF document text
    • https://cdn.sqhk.co/xugavizira/ihbhjge/space_agency_logos.pdfIn PDF document text
    • https://kapuwibipu.weebly.com/uploads/1/3/0/9/130969563/jamemoturopo_kabiwibi.pdfIn PDF document text
    • https://zopokobo.weebly.com/uploads/1/3/1/3/131383813/0bc0726200d22aa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kemetosope.epizy.com/vinosomijazetovufafazamut.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/basic_electronics_vtu.pdfIn PDF document text
    • http://sibubixusa.epizy.com/copaltite_technical_data_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/sigalegunem.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/abandono_escolar_no_brasil.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_off0000fb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB39 5440 bytes
SHA-256: 2e2940c726e2a86dc7c9bb3cd232ee208b911411c22f6274628b5bf34724129b
font_01_sfnt_off00010dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAE 10016 bytes
SHA-256: fecf3bf59ac8fabf073ad6a39913d6775f68d8392a00e92473d37deef00cf780

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