Malicious PDF — malware analysis report

Static analysis result for SHA-256 9007ad27bf81065b…

MALICIOUS

PDF

95.3 KB Created: 2021-04-21 20:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3351fbd4d499325e6477036c77271daa SHA-1: 5440ea5a78bb39652a19e0e32dfd40ec457795fc SHA-256: 9007ad27bf81065b4dda41798c3faddf61605baf804c5372d26a8cd8cc492c74
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 0.9996

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://pelibifir.ru/strik?utm_term=importance+of+writing+essay PDF link annotation
    • http://fdvsefwfrw.space/rumuziposowixopjri2o.pdfIn PDF document text
    • https://sonunupenoxomo.weebly.com/uploads/1/3/3/9/133986361/b6ce72.pdfIn PDF document text
    • https://sitixibabu.weebly.com/uploads/1/3/4/7/134749551/1bcef27f61.pdfIn PDF document text
    • http://linza.media/a_series_of_unfortunate_events_castnzalj.pdfIn PDF document text
    • http://wazasutosas.iblogger.org/24405573644.pdfIn PDF document text
    • https://fojaloda.weebly.com/uploads/1/3/0/7/130776233/gapenixu_fovinitax.pdfIn PDF document text
    • http://ulekschool.online/filmora_effect_pack_full_for_v8.xt7k3t.pdfIn PDF document text
    • https://gibitomenufe.weebly.com/uploads/1/3/4/0/134041720/8217512.pdfIn PDF document text
    • http://andyhongdigital.com/nivasiliiul4.pdfIn PDF document text
    • http://policyhelpcenter.com/40809441163vsz4j.pdfIn PDF document text
    • https://sadebisoj.weebly.com/uploads/1/3/2/3/132302749/2698872.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/resixexi/kawebasoka.pdfIn PDF document text
    • https://e108c0fa-8e70-4110-aab7-e0d30777705f.filesusr.com/ugd/d9966b_d99afd1b46ee4ca0afa516841448ebf2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bogeguva/xesatujejitokuvonakefow.pdfIn PDF document text
    • http://sivojosifa.epizy.com/what_qualifications_do_you_need_to_be_an_army_engineer.pdfIn PDF document text
    • http://fobilal.rf.gd/82799857487.pdfIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_260b51fe568d4e7fa91f4c1283d5ae85.pdf?index=trueIn PDF document text
    • http://mewiwujudulixe.epizy.com/anatomia_y_fisiologia_del_pancreas_libros.pdfIn PDF document text
    • https://165abacb-5525-4e66-971c-c167d859e756.filesusr.com/ugd/f3f2a5_7ad7e207529340689debf4707357c9bb.pdf?index=trueIn PDF document text
    • http://gadubuwarin.epizy.com/bsc4success_static_gk.pdfIn PDF document text
    • https://f64a1a0a-debf-4843-a838-a34c0cae0f4a.filesusr.com/ugd/89602e_ccd099bd2dd74066ad275f08dc3edc7c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/curtin_university_library_guide.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_off000138ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138EF 5436 bytes
SHA-256: c0f7098c66833870ba7fd0d319775ed253a82c79d5724d2ce65196afb7220deb
font_01_sfnt_off00014b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B72 10764 bytes
SHA-256: ea76175dab43cce8ca00c19fd747f2cf4cb5dd03f6fbb272e3a1a3f1dd30a382