Malicious PDF — malware analysis report

Static analysis result for SHA-256 59b4fbf5f1a739d0…

MALICIOUS

PDF

92.8 KB Created: 2021-03-16 06:39:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1de3b2e46b04a8ee56859e8d0abb77dc SHA-1: b234cadd34ce6b7bb830342f5f928627b6a9b9f5 SHA-256: 59b4fbf5f1a739d0bf3cb2dacd323533fe8034d41cb6bbca2cc967df426541cd
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and a 'download button' lure further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=trial+prep+worksheet PDF link annotation
    • https://xasukibumit.weebly.com/uploads/1/3/4/7/134749231/5687216.pdfIn PDF document text
    • https://janazasifopuno.weebly.com/uploads/1/3/4/4/134437996/torimetusurenon_vipixotavupebav_sajebanunef.pdfIn PDF document text
    • https://fidojosamesevuf.weebly.com/uploads/1/3/4/5/134594598/vesedidarabisoli.pdfIn PDF document text
    • http://siteznakomstv69.space/merchant_of_venice_plot_summary_sparknotesnmbl8.pdfIn PDF document text
    • http://tofugezupeb.mygamesonline.org/84586064071.pdfIn PDF document text
    • http://sluzhba1.net/biophysical_techniques_campbellgl609.pdfIn PDF document text
    • http://bagerisevi.scienceontheweb.net/80241541456.pdfIn PDF document text
    • http://registrat.space/battlefield_2_aix_map_packe8m35.pdfIn PDF document text
    • http://hackins.site/961039106808kmpa.pdfIn PDF document text
    • https://kafiwixuvaso.weebly.com/uploads/1/3/0/8/130874495/62bdc83.pdfIn PDF document text
    • http://glasshookahcatering.com/what_are_the_principles_of_bible_study_apps04wp3.pdfIn PDF document text
    • http://pumeputokamodo.22web.org/tozabikiwo.pdfIn PDF document text
    • http://mofemaruwek.sportsontheweb.net/gosinevumaganara.pdfIn PDF document text
    • https://gajuleli.weebly.com/uploads/1/3/1/8/131871701/6c4f72.pdfIn PDF document text
    • http://gepuladetageton.22web.org/personal_effectiveness_worksheets.pdfIn PDF document text
    • http://lebizifijafaxim.medianewsonline.com/percy_jackson_the_sea_of_monsters_book.pdfIn PDF document text
    • http://barajofa.mywebcommunity.org/how_to_integrate_software.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/9c926541-e4a3-4a7c-b6bd-e55fd8fed6d8/what_is_past_consideration_in_contract_law.pdfIn PDF document text
    • http://mijajepakiz.epizy.com/what_is_the_letter_u_in_hieroglyphics.pdfIn PDF document text
    • http://vawujularow.rf.gd/25099919688.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49065802-eec2-44d2-8017-fefd09c99bf1/catia_learning_book.pdfIn PDF document text
    • http://podapuleleg.epizy.com/fiber_reinforced_concrete_project_report.pdfIn PDF document text
    • https://6184de0c-c318-42a7-882e-c5ddc63b817d.filesusr.com/ugd/1c8c1e_634c2b4583444bee80441cacbad0bffe.pdf?index=trueIn PDF document text
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_433e3ffa3e434978b5dc362186d0a943.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000121de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DE 4692 bytes
SHA-256: 7fb5283a5c9c165c041b154c7086e110233f3656a1a0b6ad95524f78db697860
font_01_sfnt_off000131f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F0 11192 bytes
SHA-256: e39775c4dd80e2119deb64810de838548ddfd6dd2682310e57a066718d43985e
font_02_sfnt_off00015814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15814 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3