Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0101f84dd0407c2…

MALICIOUS

PDF

120.4 KB Created: 2021-02-11 16:50:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1270a661cdfc316909d276e67f037c20 SHA-1: 5bf6010836c1b165c24701acbef4ed7cb821221b SHA-256: c0101f84dd0407c2bc05e673a3242c7c29c09e1f104e659fd06485ba1c219501
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting and forming a link farm, indicating a likely attempt to redirect users to malicious sites. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://baarspo.ru/wix?keyword=yosuke+persona+4+arena PDF link annotation
    • http://wuvigirigu.22web.org/employee_appreciation_certificate_template.pdfIn PDF document text
    • https://wobosiwax.weebly.com/uploads/1/3/1/6/131607505/fa7f94f4d1c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455180/normal_5fd17e985bc40.pdfIn PDF document text
    • http://powerhdniy.space/vilasupisimijezfd27.pdfIn PDF document text
    • https://bokosemebejira.weebly.com/uploads/1/3/0/8/130813317/xelivara.pdfIn PDF document text
    • http://jisijopimif.66ghz.com/psd_background_photoshop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459788/normal_5fde32ea5f7bd.pdfIn PDF document text
    • http://shoop-fe.ru/capture_the_flag_movie_kisse7lry.pdfIn PDF document text
    • https://cdn.sqhk.co/dodalowogiv/ghfhjz8/44556510316.pdfIn PDF document text
    • https://sefedajexoxoj.weebly.com/uploads/1/3/4/4/134479396/nolegoxugatititumu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465390/normal_5fd66a370d884.pdfIn PDF document text
    • http://wowitaly.pro/10_problemas_de_division_por_dos_cifras_para_imprimir6ow0o.pdfIn PDF document text
    • http://ulekschool.online/802150543630s4yv.pdfIn PDF document text
    • https://cdn.sqhk.co/gozawelesutu/cejjbja/cw_the_100_season_7_release_date.pdfIn PDF document text
    • http://smilex.club/84374077091ffk9z.pdfIn PDF document text
    • http://jogemijafiw.22web.org/aparichitudu_telugu_songs_ing.pdfIn PDF document text
    • http://legendbilisim.com/alimentation_stabilise_variable_0-itdo1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rugadugekowe.epizy.com/sovitizuzovulu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C8B 4788 bytes
SHA-256: d4237475a51eee2ecc062fac415ed2f30e71db94b4666729fdafba024f826b6e
font_01_sfnt_off00017d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D90 4896 bytes
SHA-256: 991232e34cc0f6bff3304ef88bfd25959593187bd8d86314bed49ddb7d9f64e4
font_02_sfnt_off00018e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E4C 15444 bytes
SHA-256: ec849e7b4b97abf91fc93755f47fec1739d6291d0bf3b65094210716df51dde3
font_03_sfnt_off0001be98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE98 16088 bytes
SHA-256: 62b3948e0e40d8ba1e83d9aa19c7af70085e7b6691727982ba447b75cbddb3f9

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