Malicious PDF — malware analysis report

Static analysis result for SHA-256 3564d24cb574730d…

MALICIOUS

PDF

82.6 KB Created: 2021-04-03 23:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: c521444ed1fea9e43a52c262c8b84ce7 SHA-1: e7c003ccff67ce2d7fc61ab301634d511ead4f84 SHA-256: 3564d24cb574730d79ced1e40830d92cc094b8375e77798db515875d8cc01327
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs, with one pointing to `https://golowaki.ru/strik?utm_term=ap+seminar+end+of+course+exam+2016`, suggesting a lure to a malicious site. The document body is heavily obfuscated, but the presence of external links and the overall heuristic firings strongly suggest a malicious intent to redirect users to potentially harmful content.

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://golowaki.ru/strik?utm_term=ap+seminar+end+of+course+exam+2016 PDF link annotation
    • http://pinenud.mygamesonline.org/bilosukajima.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380214/normal_6053baa197143.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385435/normal_5fdf712fb1381.pdfIn PDF document text
    • http://ductsunlimitedins.com/9538590174683gca.pdfIn PDF document text
    • http://maturibcgj.space/26184785260a3jg1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496586/normal_60252fb5b7a36.pdfIn PDF document text
    • http://xapufogoximemin.22web.org/86314533987.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467581/normal_6004e36ea6d26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417980/normal_6024b554dfcf8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476453/normal_603180faa2b34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478387/normal_6020061389704.pdfIn PDF document text
    • http://kuzososo.mygamesonline.org/automobile_engineering_ebook_download.pdfIn PDF document text
    • http://jelolizabuvixi.22web.org/algebra_1_textbook_holt_mcdougal.pdfIn PDF document text
    • http://4338bacchus.com/ratujukekor5579.pdfIn PDF document text
    • http://tiktokcopyrighthelpteam.com/6522642545642wzs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://laletanegimiw.epizy.com/study_habits_and_academic_performance_quantitative_research.pdfIn PDF document text
    • https://938a05da-450f-421e-a59b-0448473a402a.filesusr.com/ugd/cb5dea_2d6a5bd5c6d04967ae906ab1d438af8b.pdf?index=trueIn PDF document text
    • http://roporuti.onlinewebshop.net/competition_law_books.pdfIn PDF document text
    • https://677f84e8-2a3b-482a-8721-58d714100356.filesusr.com/ugd/086aec_c4d28ba58ae549e9999f188423746a2f.pdf?index=trueIn PDF document text
    • http://vevosewis.rf.gd/blood_types_diet.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_off00010493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10493 5804 bytes
SHA-256: ce2d8c1b60024013211b21c8b34ca2161e4261efedf2cebbda9bc06b848be195
font_01_sfnt_off00011851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11851 10844 bytes
SHA-256: 2be6cd24d01f57858ed24f4732aedb6bfaf34319d356d49ee935cbaaa2ab9139

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