Malicious PDF — malware analysis report

Static analysis result for SHA-256 93f4defe2bf2c2c8…

MALICIOUS

PDF

75.4 KB Created: 2021-04-05 18:42:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ada62dc2ab42a73be872f97bca9355e3 SHA-1: df266ffcb08de797169f5c1d650523c6eb31f785 SHA-256: 93f4defe2bf2c2c88b66c7f386ab321c6014fe4fc6af5b96d9c1705f9068d700
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://leonvi.ru/strik?utm_term=2019+lexus+rx+350+f+sport+awd+for+sale PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454824/normal_603d1fff8fd16.pdfIn PDF document text
    • http://xazowagef.mypressonline.com/89861591700.pdfIn PDF document text
    • https://najibiwamedixi.weebly.com/uploads/1/3/4/9/134901652/f6ceb842.pdfIn PDF document text
    • http://dozusudifajew.22web.org/ashrae_2020_duct_fitting_database.pdfIn PDF document text
    • http://mugurapit.sportsontheweb.net/campbell_biology_uofa_4th_custom_edition.pdfIn PDF document text
    • https://tejikapor.weebly.com/uploads/1/3/1/3/131382395/278143.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383791/normal_6037a291b7aaf.pdfIn PDF document text
    • http://fibisazorowax.mypressonline.com/58630206063.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366034/normal_5ffc56e8b4608.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426547/normal_604cd9421e9f2.pdfIn PDF document text
    • http://mokaxizekebade.scienceontheweb.net/body_attitude_test.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0879403c-3be5-48e4-925f-21334a7d5cfe.filesusr.com/ugd/407fcc_02a37917519447b39e250fb70e52278a.pdf?index=trueIn PDF document text
    • http://pabewuvuxaf.onlinewebshop.net/81820040547.pdfIn PDF document text
    • https://9c12218e-e157-4070-b33f-4467b3cb42bb.filesusr.com/ugd/0c60a0_62c605dc2bf6424799c0e1604f90d120.pdf?index=trueIn PDF document text
    • http://zexukojol.rf.gd/72944252639.pdfIn PDF document text
    • https://0a37a3d5-a0bf-4e77-8ff5-6127fd08aefa.filesusr.com/ugd/6046c9_4a35d4f631694a00ac7b93e76e51838b.pdf?index=trueIn PDF document text
    • http://wasomozonomevam.rf.gd/epson_perfection_v600_vs_v550.pdfIn PDF document text
    • http://nimitijas.rf.gd/asphalt_xtreme_apk_and_obb_file.pdfIn PDF document text
    • https://5fb3b2f4-e86d-4029-b823-ac5950ddf4c1.filesusr.com/ugd/c0aa49_83940074434a4fbc8a29aa3981a1638d.pdf?index=trueIn PDF document text
    • http://xigakixu.epizy.com/az_900_exam_questions.pdfIn PDF document text
    • http://dekibej.epizy.com/45451879028.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_off0000e6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F9 5872 bytes
SHA-256: ef9380404cad5666d3bc1db3159261808af8579a980d79aab66e25b7c4d6f7fc
font_01_sfnt_off0000fb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB17 10836 bytes
SHA-256: e64d1ae56e978764e8495e96d6436541b712ea422def623eb959d6ef9b522df5

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