Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e10f5b66d54ec9c…

MALICIOUS

PDF

64.0 KB Created: 2021-09-26 19:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 994f0ffc5e9b5fcc08b46657f18a7be1 SHA-1: 37cb54cbf721d50e46753c0acd1c01b22e8cf630 SHA-256: 8e10f5b66d54ec9c27235408e3b120865d2d67be42bb409ec31a84c074eef668
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure malicious intent. The ML classifier and ClamAV detection strongly suggest malicious content, likely for phishing or malware distribution, leveraging the embedded URLs as the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6126

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 http://lammermoor.net/imagenes/file/79409967728.pdf In PDF document text
    • http://mwflower.com/upimagesfile///wogam.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/50872068906.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/92346881636.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/92402991241.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210907015503.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/lapenatix.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/namatote.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/38303139259.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/tt1skf9tnfealnfjhja7b9o991/pazubujewaxosa.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/kesitagokogefudikakop.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/93831520294.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/nonemepiliza.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210910231649132.pdfIn PDF document text
    • http://nenorm.com/files/files/xisinat.pdfIn PDF document text
    • http://vanhacollection.com/images/files/benalenuworapup.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/20106929231.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/jetukuxatid.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/xarikobumololojifomu.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/dijuw.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/wapise.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=a+quiet+place+2+stream+free+onlinePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB06B 17008 bytes
SHA-256: 7ba444fe8e8f7d073bf931df4faebcbbfa8b3b280127bb9017dd8e7f55f94c49
font_01_sfnt_off0000db26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB26 10988 bytes
SHA-256: 88870b6945d30fa90360c4dc7adc48026fee1c6c734367ca5bc44ff1fd806409

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