Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7e7fbf9d6f5e46e…

MALICIOUS

PDF

71.3 KB Created: 2021-09-11 03:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d55519a83cc570642651c360ee94e339 SHA-1: 30506041d7a830655b9b0643023610d795fac70e SHA-256: c7e7fbf9d6f5e46e1e16138e3a17fc5604989d01d8938379b4b3fd6a09e93437
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9840

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://computerzone.pk/file/72930107088.pdf In PDF document text
    • http://skisun.it/userfiles/files/bigobudafivaxakepegora.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/pitepimusovudejotusufu.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/newogixusigofosibejuwek.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/72011691361.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/kewigom.pdfIn PDF document text
    • http://inercial.es/uploads/files/kusabaleradomixexo.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/fukarulujulijowubik.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/38042663179.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109092105475711.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/jifinufoforumewewo.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/159786525561331fa241f5a.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210905094212.pdfIn PDF document text
    • http://ozcetinler.com/userfiles/file/66174833048.pdfIn PDF document text
    • http://goghepcacloai.com/media/ftp/file/47256268019.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80333068208.pdfIn PDF document text
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/sekapusimuzu.pdfIn PDF document text
    • http://e-menu.hu/editor_up/94948930830.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/76852908615.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/vefodereraza.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613121a376951---sigodesovivofazano.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/kitupimedoripufodo.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-2/20210902044741726386.pdfIn PDF document text
    • http://www.yt333.com/userfiles/20210911/file/1631298194.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210905_9ED66D9D24BD8587.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/95179089619.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=vidmate+android+downloadingPDF link annotation
    • 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://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_off0000b846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB846 15604 bytes
SHA-256: 3cec72a0195eadc27ac3d47267240adc54efb58b7b9584bd7ebee6ae3e29af3e
font_01_sfnt_off0000e003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE003 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81A 10476 bytes
SHA-256: 2bfb46416afb690b7752f0ed9e2f635a2778c1d21548c17000d2208506cec54f

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