Malicious PDF — malware analysis report

Static analysis result for SHA-256 6111283656850024…

MALICIOUS

PDF

83.2 KB Created: 2021-09-14 12:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 8924fd51a40c47e00165ce5bdd4f98d9 SHA-1: 2e83bb8149148c343186320867b13ca0b39fb981 SHA-256: 61112836568500243355e4e479da422a749cc79ceca7a1191d2045469f5084bd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF is part of a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ikansambel.com/contents/files/20429022196.pdf In PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/tawemejalujaxoxokebizoxap.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/mesufafemolusetemixi.pdfIn PDF document text
    • http://wawa757.com/uploads/files/puzuwowuso.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/ridasekusod.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/8854909648.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/konowobuvekiwagal.pdfIn PDF document text
    • http://www.agot.pl/upload/file/kazolozemamafawarox.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/35507394947.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/62058179590.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/bisetadimavepejitiwad.pdfIn PDF document text
    • http://sdes.in/uploads/lorasonejefivebetetak.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/43940151053.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/74538568329.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/4564495509.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/kakomeze.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/70669601122.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/pisifododav.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/22400493222.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210902205212041.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/31580371481.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-9/20210909125008985796.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/jekaku.pdfIn PDF document text
    • http://boldogelet.hu/media/pajedodagolupojodetopazi.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/votugedikodokot.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/tefopijeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=filmy+apk+downloadPDF 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_off0000e003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE003 10324 bytes
SHA-256: 6a777a7e2b0b17dfc2da3dd78850cbad654359e27db820f7e5c4e253dc5d1134
font_01_sfnt_off0000f732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF732 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F44 18336 bytes
SHA-256: c9a44b617ea18379e819b2ccc5c54b130a844dadf8806925201eebc088a0b20a