Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5e2df8bf85a0157…

MALICIOUS

PDF

84.6 KB Created: 2021-02-24 22:24:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6e40e92c8b683869c1b790229b3ccf08 SHA-1: 29dc38a1fea829c7358b703f78928d890554af2b SHA-256: e5e2df8bf85a0157131d52d88eedd4ac366956f59a8e70b93f5d7ed02174f6c1
124 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or redirection scheme. One prominent URL, 'https://seumenha.ru/strik?utm_term=why+is+autonomy+justice+beneficence+and+nonmaleficence+important+in+healthcare', appears to be a lure, potentially leading to a phishing page or malware download. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9534

Heuristics 4

  • 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
  • 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://seumenha.ru/strik?utm_term=why+is+autonomy+justice+beneficence+and+nonmaleficence+important+in+healthcare PDF link annotation
    • http://xoziduso.mypressonline.com/mifesevuwarufavupepax.pdfIn PDF document text
    • https://cdn.sqhk.co/mitejapeki/idChbhi/techcrunch_disrupt_hackathon_winners.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419630/normal_5fcf8a2418e65.pdfIn PDF document text
    • https://cdn.sqhk.co/rorajakura/vmgiidE/short_animated_love_story_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414167/normal_602d3f44938e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377380/normal_601f76fb25982.pdfIn PDF document text
    • http://barajofa.mywebcommunity.org/midefin.pdfIn PDF document text
    • https://cdn.sqhk.co/rekubapapup/fLhehgj/spin_orbit_coupling_constant_formula.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463552/normal_5fd67fcb8def8.pdfIn PDF document text
    • https://sapakuso.weebly.com/uploads/1/3/5/2/135297556/sikidov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477379/normal_601851c410fa8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452392/normal_5fdf6f012a544.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/uihjcij/swot_method_for_marketing.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489429/normal_5ff0be60c0104.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gixarewujedel.atwebpages.com/89816725488.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/html_to_using_pandoc.pdfIn PDF document text
    • https://s3.amazonaws.com/tafogusegabomu/70277437073.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B78 5724 bytes
SHA-256: 9b71396ba349073f1926377dd8552cab207ccd94c2d481242253a4f112707047

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