Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f52c4b3cb2299ee…

MALICIOUS

PDF

95.0 KB Created: 2021-04-27 18:14:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a03eead2bf4e3378398924ed7a98b48c SHA-1: e3f1b55a5af5274cb4515fe1d64db3dac5e22019 SHA-256: 6f52c4b3cb2299eec38885d7577792a7804ee0a350287b4fb8dd3f0980407782
186 Risk Score

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-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.
  • 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://midufefew.ru/strik?utm_term=commentarii+de+bello+gallico+english+pdf PDF link annotation
    • http://rivuxini.66ghz.com/blended_and_clipped_words_worksheets.pdfIn PDF document text
    • https://jafipununevov.weebly.com/uploads/1/3/0/8/130814040/xiwivog.pdfIn PDF document text
    • https://wufodiwefoveve.weebly.com/uploads/1/3/4/8/134891768/bamonis.pdfIn PDF document text
    • http://zuvomitapafi.22web.org/les_miserables_original_broadway_cast_recording_lyrics.pdfIn PDF document text
    • http://fawikenaxalu.scienceontheweb.net/kawedipoluka.pdfIn PDF document text
    • https://liramuxusere.weebly.com/uploads/1/3/4/5/134577046/pubepuvaduwat_gomogigegaba_lewisulonexig_zilofuza.pdfIn PDF document text
    • http://gidujoluj.mypressonline.com/joint_formula.pdfIn PDF document text
    • http://vivekawiga.sportsontheweb.net/cual_fruta_no_engorda.pdfIn PDF document text
    • http://tasefuvakol.22web.org/budibavikigimepasage.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sujevulakaginig.rf.gd/15684470156.pdfIn PDF document text
    • https://08b4a39d-fa16-4eaa-91be-ae90003cacb9.filesusr.com/ugd/237bf7_f9c025dbc6c145c8b7e0e7239219efc8.pdf?index=trueIn PDF document text
    • http://kejiguwudo.epizy.com/44007987942.pdfIn PDF document text
    • http://makijozexu.rf.gd/library_arduino_esp8266wifi._h.pdfIn PDF document text
    • https://2b075577-062e-477b-ba44-a680027dca12.filesusr.com/ugd/ee943f_718c337e36ac43b1a92a9caf54b60412.pdf?index=trueIn PDF document text
    • http://kebanibaru.epizy.com/behaviorist_theory_of_language_acquisition.pdfIn PDF document text
    • http://riturofuvesugo.epizy.com/16407370248.pdfIn PDF document text
    • https://814cba0f-f649-4223-bfe6-7884e6e02b9d.filesusr.com/ugd/c1108c_6dc236838c7d490c83c2133919da844c.pdf?index=trueIn PDF document text
    • http://zikinevubebera.epizy.com/tomato_companion_planting_guide.pdfIn PDF document text
    • http://wagibederujejo.rf.gd/2020_calendar_with_holidays_usa.pdfIn PDF document text
    • http://sasukagisodubex.onlinewebshop.net/puma_air_compressor_air_filter.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_off00013102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13102 5612 bytes
SHA-256: 6a27161533996821eca83896dbcda422f5ca15ecd52f358f8ba57bf64c8c8beb
font_01_sfnt_off000143e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143E3 13624 bytes
SHA-256: bdfd19a579ee623e42505fe2fa637d1cffe4be28d7245ce7e20d0263f67e0b03

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