Malicious PDF — malware analysis report

Static analysis result for SHA-256 6383f33ef05ee540…

MALICIOUS

PDF

94.3 KB Created: 2021-03-28 08:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 64aacf68937a05278dd6d54b8f4f4b93 SHA-1: 0af75112b8d1105dddf858b6fc435bccea4b0cb5 SHA-256: 6383f33ef05ee540ea4f18f8ead5bb2bc3b294cfa066c15784df1f132473c8ab
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. The embedded URLs, such as https://botokaw.ru/strik?utm_term=decide+who+you+want+to+be+quotes, are likely used to redirect users to phishing or malware-hosting sites. Although no scripts were explicitly extracted, the PDF structure and numerous embedded links suggest an attempt to exploit users through deceptive 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://botokaw.ru/strik?utm_term=decide+who+you+want+to+be+quotes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402247/normal_602513b7c4b30.pdfIn PDF document text
    • https://cdn.sqhk.co/rolaravez/vUn3jfh/52510436485.pdfIn PDF document text
    • http://tactical-jacket-sale.shop/jemepilirupijoletewagn7my9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447916/normal_60459df71eb85.pdfIn PDF document text
    • https://cdn.sqhk.co/kofelejezem/O723Kij/suvoturuvozusurosi.pdfIn PDF document text
    • http://verifybadgehelp.com/into_the_wild_jon_krakauer_chapter_4_summary64twf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411218/normal_605ee9d0ebe10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420441/normal_5fc79fb49bcf3.pdfIn PDF document text
    • http://nncucuucuc.space/56982364436d3n69.pdfIn PDF document text
    • http://xteenware.online/xazotaxw16a7.pdfIn PDF document text
    • https://cdn.sqhk.co/gixixutiji/00SGpC6/noxinevegonixixu.pdfIn PDF document text
    • https://cdn.sqhk.co/fakineduxafe/jeuKps3/vivodelofuzuvulipe.pdfIn PDF document text
    • http://vakodilaxen.iblogger.org/how_to_improve_writing_skills_in_english_for_upsc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427795/normal_604786c37baad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kunizifafam.epizy.com/39224048840.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/lomalufawumejulobimuf.pdfIn PDF document text
    • https://s3.amazonaws.com/setikizo/batoleduxilukebefuj.pdfIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/strong_versus_weak_acids_pogil_answer_key.pdfIn PDF document text
    • http://duguteterexu.epizy.com/alibaba_company_profile.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_off000132b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B5 5356 bytes
SHA-256: d4f4b8266b9c8bf2c02503bbf459fda43c5bed3d35aba1979d47da9d13761a9c
font_01_sfnt_off00014506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14506 11056 bytes
SHA-256: dd378b830eecbbfea316aeed12bc464bbd09138a7572e656e1a015a4bda24f96

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