Malicious PDF — malware analysis report

Static analysis result for SHA-256 a65accc4b2a88b19…

MALICIOUS

PDF

63.8 KB Created: 2021-09-09 04:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a92da93a31dd09a745aaf38ab9a27ad0 SHA-1: a7fd702c8ee4ce4c6c2f189d821c9bb867e448c7 SHA-256: a65accc4b2a88b19ec39973f83ce9854299c6c0148f7895dd47ef8caa2e4a05a
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination of the links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7155

Heuristics 4

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=how+to+change+home+screen+on+samsung+galaxy PDF link annotation
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/ff146f7cf499ed3cf9e30ab9e4fa7ee6/momilakuruzuzilalevajoz.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/gebaxudumamosarexin.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/setizevobivi.pdfIn PDF document text
    • http://archbot.pl/files/file/jaselobagefatudisidizelof.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/78189341621.pdfIn PDF document text
    • http://mamam.by/upload/File/file/debukirofolamodakizez.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/29667578566.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/66120481641.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/jizixanirabasinel.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/36625475618.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/23903176169.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210902101146.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/xojefaboxa.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/newevosomilufilum.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/161314413051f9---97642019360.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/11684007174.pdfIn PDF document text
    • https://bkairconditioner.cloud4demo.com/uploads/files/govidex.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/67765838726.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/peduluvotor.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/79245082968.pdfIn PDF document text
    • http://debten.net/UserFiles/File/30033896100.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/rogelupojalejulupiba.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/foxemarijefove.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_off0000d927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD927 10976 bytes
SHA-256: d993416b890c11773e0148d1ca777c987ac0e39430a6a001d50cde4d5b9ea06e

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