Malicious PDF — malware analysis report

Static analysis result for SHA-256 079e5a81a6cd712b…

MALICIOUS

PDF

70.8 KB Created: 2021-10-09 10:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0fd82e04ad1ac648ea66d55fba11160a SHA-1: d967ac78729cbe4a36cec0794f3eb1a0c65c5c01 SHA-256: 079e5a81a6cd712b76de9838ef5fc865ae6ea6c6de5e6edb17d20b2af2d40f56
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links pointing to disposable hosting, suggesting a tactic to distribute malicious content or phish for credentials. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://triple-a.co.th/ckfinder/userfiles/files/noguwujokeg.pdf In PDF document text
    • http://inteko-tula.ru/f/file/47370540572.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615adcba5f4a7---kosuwiniluzukegarovaxata.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/82978936067.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/33675119899.pdfIn PDF document text
    • https://costarica4d.com/contents/files/51503280228.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/57154133616.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/wibewirenanetotala.pdfIn PDF document text
    • http://guowangcable.com/d/files/21175385220.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/94935327440.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/92172406426.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/48880665613.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/vamabegakukewelexolizedu.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/xefimu.pdfIn PDF document text
    • http://askaudit.ru/price/47938975411.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/nutawided.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/dozipenamofugavudawef.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/10844764087.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/11865921409.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/nefisileziwofefasusa.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/wunamake.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/89509233506.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/dolokaxuwepixazefedip.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/11938343064.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=srand+was+not+declared+in+this+scope+c%2B%2BPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/46610883916.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://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_off0000b3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D0 10772 bytes
SHA-256: 0786c5c93db5754db6a7c70708dc90d244e535b7a6f100402d7b7fd24454a86e
font_01_sfnt_off0000cc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8B 15552 bytes
SHA-256: df495b9369775c617b1b544415e03e86ae2fa347bf334906f7c51b8fd6a33272
font_02_sfnt_off0000f394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF394 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1