Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5ac1eab30a6c11…

MALICIOUS

PDF

78.0 KB Created: 2021-02-28 08:25:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 54d0d1eca8d3ee3aa72dcce2f87891d1 SHA-1: cf025ab8078d6f463217a1b4b2c50c4433b126bd SHA-256: db5ac1eab30a6c11b89d2213ee2be277ebc290c6516ef581edae4d33fb8cc715
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

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://maypoin.ru/wix?keyword=the+brachial+pulse+is+located+where+on+the+body PDF link annotation
    • https://sepiximefajo.weebly.com/uploads/1/3/4/8/134849953/9339255.pdfIn PDF document text
    • https://zovipimisog.weebly.com/uploads/1/3/1/1/131163747/vavipozotujizirunuba.pdfIn PDF document text
    • https://liberiloro.weebly.com/uploads/1/3/4/5/134589576/xasigodonujigof.pdfIn PDF document text
    • https://rutikaxa.weebly.com/uploads/1/3/0/7/130738846/xabole.pdfIn PDF document text
    • http://rijewomel.scienceontheweb.net/6883581764.pdfIn PDF document text
    • http://monufovaxuj.66ghz.com/remote_computer_access_software_free.pdfIn PDF document text
    • https://vedudogekikusiw.weebly.com/uploads/1/3/1/1/131164168/fiteso_jalidefevuvebit_musopu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sivebiza.epizy.com/90792592641.pdfIn PDF document text
    • http://tapavakagazu.epizy.com/children_s_day_images_and_quotes.pdfIn PDF document text
    • http://taperimogitunal.epizy.com/calculus_10th_edition_answers.pdfIn PDF document text
    • http://vitorozakosi.rf.gd/five_nights_at_freddys_5_free_download_ios.pdfIn PDF document text
    • http://zasegusof.epizy.com/14542758222.pdfIn PDF document text
    • http://pugetuwozijeso.rf.gd/gun_cabinet_woodworking_plans.pdfIn PDF document text
    • http://xokofenox.epizy.com/application_letter_format_for_phd_admission.pdfIn PDF document text
    • http://sowinoto.epizy.com/self_certification_form_scotland.pdfIn PDF document text
    • http://rokusagotigenov.rf.gd/computer_institute_admission_form_format_in_word.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_off0000f528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF528 5444 bytes
SHA-256: a3a16fa6b3cb4b152523d578a4040541093499ac1ef8653f406ed7e1c2b21116
font_01_sfnt_off000107ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AD 10224 bytes
SHA-256: 7c016e07fb59247df9800b0081ee918f0a14d28b089c0c9651474ba13b416e5a

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