Malicious PDF — malware analysis report

Static analysis result for SHA-256 a37d07b0c39a4e9e…

MALICIOUS

PDF

74.7 KB Created: 2021-02-21 21:44:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 8bbf339692c1d05a527a769bb396dd8a SHA-1: 87fb1cdfaaa76882179c3d87cfde5b4aa1dc0d85 SHA-256: a37d07b0c39a4e9e10eb40d14807c503ed2cfd4e5bb6dd724cc832c20ef45641
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file contains numerous embedded links that redirect to potentially malicious domains, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, appears to contain search query-like text, suggesting a lure to trick users into clicking these links. The ML classifier and ClamAV detection further support the malicious nature of this file.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=what+is+the+structure+of+dna+made+of In PDF document text
    • https://cdn.sqhk.co/moxulofilose/jaUZQgc/12505655898.pdfIn PDF document text
    • http://maturibcgj.space/correlative_conjunctions_exercises_multiple_choicelctg9.pdfIn PDF document text
    • http://ecoservice-vlad.ru/myers_briggs_personality_meaningfo0op.pdfIn PDF document text
    • http://acupofjacob.com/student_exploration_carbon_cycle_answershhxgh.pdfIn PDF document text
    • http://futup.ru/67610386507jyma5.pdfIn PDF document text
    • http://classicalnaturally.com/geridararn6okc.pdfIn PDF document text
    • https://fimosezit.weebly.com/uploads/1/3/0/7/130775491/guzusokudirefomova.pdfIn PDF document text
    • http://barcaporirternet-interbank-pe.com/what_is_along_for_the_ride_means3zztz.pdfIn PDF document text
    • http://yognat.space/vivah_movie_bestwapyuxay.pdfIn PDF document text
    • http://triple-doska5.club/android_apps_not_ing_startingcdf8b.pdfIn PDF document text
    • http://insuranceautousa.com/what_does_managing_upwards_mean9iw2y.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58B 5244 bytes
SHA-256: 269e8a31ccc502d84bbf38305b4a6288aff8035d1d06e27f0ed12837c448ff62
font_01_sfnt_off0000f740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF740 11360 bytes
SHA-256: 130c11b7f2c1c2ca619e87a5efe0ce7256a6155a43203c2ec3b42e904ae8abff

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