Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe7310adaf82226b…

MALICIOUS

PDF

86.1 KB Created: 2021-04-05 09:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 43debadc482bd040f5bc3acb1c42f47a SHA-1: b7ffff0aec3e82a70933dbcee9e5bb497e150452 SHA-256: fe7310adaf82226bb2406d203714788ab024758fb509bb2eeff2465b68286cd4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. The primary IOC is the URL 'https://seumenha.ru/strik?utm_term=what+does+the+area+under+a+velocity+vs.+time+graph+tell+you', which is likely used to redirect the user to a malicious site.

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://seumenha.ru/strik?utm_term=what+does+the+area+under+a+velocity+vs.+time+graph+tell+you PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387565/normal_5fdab1f6be425.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408464/normal_5fdc7cee9d642.pdfIn PDF document text
    • http://cartest.pro/bronze_age_inventions_timelinejjpm8.pdfIn PDF document text
    • https://talowitutujuf.weebly.com/uploads/1/3/3/9/133999148/8327ff4645bce.pdfIn PDF document text
    • http://coins24h.com/munixoffzoz.pdfIn PDF document text
    • http://lisolu.org/kelupuwuxaboposutofuvlsdnf.pdfIn PDF document text
    • http://tojuvapemupo.mywebcommunity.org/85542073502.pdfIn PDF document text
    • https://barobinamad.weebly.com/uploads/1/3/4/7/134756413/sutikuletevo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379387/normal_5fdd0457c73db.pdfIn PDF document text
    • http://monoga.space/kimalicyhek.pdfIn PDF document text
    • http://vumogegotawugub.mypressonline.com/mercedes_vito_dimensions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483365/normal_600f249b84403.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4e33067b-0f13-4bed-bb9c-ea95f768fd7c.filesusr.com/ugd/23924c_7500456e28eb497baf999509c1839544.pdf?index=trueIn PDF document text
    • https://3dd85f33-233b-4b3c-8e53-142bc8307eec.filesusr.com/ugd/8df890_b0cffb87905a45f39b2c12d474fa05de.pdf?index=trueIn PDF document text
    • https://391e4f24-9fc9-4707-ac06-338edcd9f959.filesusr.com/ugd/110ef3_2829bd232e60477696aae599fa4ea85c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zosevid/lauren_kate_fallen_sorozat.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/fesumetaremoli.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/67879869402.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/luvarikaxufufikutu.pdfIn PDF document text
    • http://zuvuzevo.atwebpages.com/2002_ford_explorer_sport_starter_relay_location.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5D 5692 bytes
SHA-256: 17cfeb169dd8a10c0b918f2c8fb02858c50e8479a31376d13b301ebd31b94815
font_01_sfnt_off00010fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB2 10744 bytes
SHA-256: c96caaca6e2c0195da8991094065648ab34b7e93536a52e5d76580f5fe9299b5
font_02_sfnt_off000134d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D7 16148 bytes
SHA-256: aabbb95e4258a1bccfe6759090a0a8b97a33e8154131110566ffb2eaa8fdb080

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