Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbfba29a705b3027…

MALICIOUS

PDF

73.2 KB Created: 2021-04-07 07:31:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 07ca6a08cbb6e900a358711f69a2ff3a SHA-1: c3c3cbc51c50b30f62878d8f3ec84fef3b383051 SHA-256: cbfba29a705b30273e1f30f86488511dd39aafc88c78ece284d72f1cceb49af6
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous external URIs, many pointing to disposable hosting, and employs a social engineering lure to trick users into installing a browser extension or update. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it is designed to redirect users to malicious sites, likely to download further payloads or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://lozipotod.ru/123?utm_term=joomla+news+magazine+template PDF link annotation
    • https://vitafidazi.weebly.com/uploads/1/3/4/7/134728623/8828239.pdfIn PDF document text
    • http://lologunaw.mygamesonline.org/articles_worksheet_3rd_grade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484093/normal_602488db02ad8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489980/normal_5fd39067232db.pdfIn PDF document text
    • http://nitapida.mywebcommunity.org/habitat_of_bryophytes.pdfIn PDF document text
    • https://lobigemef.weebly.com/uploads/1/3/2/3/132303116/4258533.pdfIn PDF document text
    • http://nowukusox.mypressonline.com/vikamotigegusezuxefujugi.pdfIn PDF document text
    • http://kijekidajefi.getenjoyment.net/memrias_pstumas_de_brs_cubas_filme_completo_dublado.pdfIn PDF document text
    • http://wemorewabadeluz.mygamesonline.org/mathematics_formula_for_jee_main.pdfIn PDF document text
    • https://litemavokof.weebly.com/uploads/1/3/1/8/131871991/e3dfed1c635eb6.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/wuniku/letter_writing_format_for_leave_in_school.pdfIn PDF document text
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_6b46931ce16d461eaeb9e9c25753c2ab.pdf?index=trueIn PDF document text
    • http://dipijiz.epizy.com/hplc_chromatography_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/fnma_student_loan_guidelines_2017.pdfIn PDF document text
    • http://nesowoxaxisaxa.rf.gd/63225318639.pdfIn PDF document text
    • http://milodip.epizy.com/60052668852.pdfIn PDF document text
    • https://97e6e6c8-040d-427c-ad66-6ef02350ae38.filesusr.com/ugd/9c523c_898f842a51ad4806ad6fa07ec9a319ac.pdf?index=trueIn PDF document text
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_89a0160565f44fbb84910d0a7ae2272c.pdf?index=trueIn PDF document text
    • http://nozamoto.epizy.com/xizof.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/what_programming_language_is_matlab_based_on.pdfIn PDF document text
    • https://ff87c8b5-ca28-4ac0-94ba-218234037d87.filesusr.com/ugd/1d4e4f_0b9a724108e74ecb933aaf91cb2fa843.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_off0000e23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23B 5176 bytes
SHA-256: 33ffa8f05a6935c7efa4826f959e1cbb94e5c6cbb4f811d984daa70edf996825
font_01_sfnt_off0000f3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E6 10600 bytes
SHA-256: b6f75e4d4badfa6b9f8d05acc48b2d6f11789c9498d3d92b72397c846f6bd801

Open this report in the interactive analyzer, or submit your own file for analysis.