Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e8977688f21907f…

MALICIOUS

PDF

85.1 KB Created: 2021-09-11 19:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 2c365ca74bf6029bd987cd9ddf3bf3a6 SHA-1: 595ccf336740b020342f33b474d0384509ce10da SHA-256: 0e8977688f21907ff2db5e410a9ceff72223b8ad8389a502f80410b5f47ea97d
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. 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 0.9980

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137648778b11---limawesev.pdf In PDF document text
    • http://omeofest.eu/userfiles/files/wexipuxipefuxera.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/88926346552.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/48657521848.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/japana.pdfIn PDF document text
    • http://regcureguide.com/files/files/jetedesazawukozuvok.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210902_45ABCA2388AAB476.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lk4ilu7bfmmql0vbjesfvrcki3/tinaduruvelojamejeseneli.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/zekukop.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/pofuxavaxa.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/94237699047.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/retiditudibose.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/nozaxezotezakizevepu.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/zawovetim.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/rafifolorunigizevin.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/felomopo.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/ligipasabevozid.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pj5tjqke2ge3t6uqv5fbohlmk4/24839302660.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/dururudigojedew.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/3512033836.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/62002100900.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/piwusunifokusitajuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=instalacion+limpia+androidPDF 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_off0000e5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EF 10492 bytes
SHA-256: c42d9583670cec052349557feeee427f17142f35e638c38d3d90e35eb6e8a114
font_01_sfnt_off0000fdb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C9 18628 bytes
SHA-256: 4d84c298e4f3d3c94443e6e9a6b4777062c8d01cf6187ba7d8ee834f9a5cff21

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