Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ecd043050f8e154…

MALICIOUS

PDF

59.5 KB Created: 2021-09-26 20:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7e57abdb1a20448956bdb47559fa2a4a SHA-1: f878517325888b5a963dd6ea8cda2549cd5edc59 SHA-256: 5ecd043050f8e1544620720044f9d94403c6789bccf6568a8ca28801d54ed94a
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates these links are likely part of a phishing or malware distribution scheme. No scripts were extracted, but the presence of many external links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7008

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://krisoc.ru/uplcv?utm_term=nice+adjectives+beginning+with+r PDF link annotation
    • https://bushregenerators.info/userfiles/files/13020305112.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/latevigakenimubenuxivow.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/78732330923.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/dapigazit.pdfIn PDF document text
    • https://mar3ol.com/Files/files/vudemewopozupizidub.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/9ebaa83dbab89951f5cfdbdeb80a36f4/wozuxafigafipereziwub.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/walokugurumuliderowitopix.pdfIn PDF document text
    • https://mollis.rs/files/sazovomodovipo.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/90140662037.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/41777897189.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/67975280061.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/nemanasu.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/fowerisazekowapegimogal.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/5520090920.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/53428066288.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133abc76f6b2---87357944837.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/zupexanejanuzenokamamili.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/merusexabew.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/gewuvewememulekezesuwa.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/84951617716.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/24088890285.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/pekakozewuwigotifozinar.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/68584820765.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/50425313020.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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