Malicious PDF — malware analysis report

Static analysis result for SHA-256 352c0d677908edc7…

MALICIOUS

PDF

65.1 KB Created: 2021-09-17 19:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c47f8f74f936f9cc5c500c93bafbd09f SHA-1: 634f982a01ef571fd3395dae33390aacd4abb69d SHA-256: 352c0d677908edc7d57e915d33cfd4fd80330bec961e5f93e8e0a4abccb8e126
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to a link farm, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier further support its malicious nature. The sample's structure and the presence of many links on disposable hosting suggest it's part of a larger phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5690

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=prince+of+persia+the+forgotten+sands+for+android PDF link annotation
    • http://yuha.be/_files/file/6002573897.pdfIn PDF document text
    • http://lj-group.cn/upload/files/68801069260.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/66943038685.pdfIn PDF document text
    • https://halkapsikoloji.net/userfiles/file/53290111958.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/texexej.pdfIn PDF document text
    • http://shesob.com/file/files/57767906887.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/sisosenigit.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/mamuzunefebijegetoradokak.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/xiwapunuberedep.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/32445667182.pdfIn PDF document text
    • https://duel.pl/userfiles/file/93747548663.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/gomopenad.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/54334853337.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/kegewexoneb.pdfIn PDF document text
    • http://inphilong.com/upload/files/971075249.pdfIn PDF document text
    • https://beaszemin.com/files/79447825538.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/88533805517.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/25060334196.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/88491413768.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/gokofixubunanere.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/9e2276b610c8655d4498d363f029d467/90943104186.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/30327348170.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/kimikexexudoxogezosano.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/81491916671.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/rabufosagetovenunusanoso.pdfIn PDF document text
    • 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_off0000b528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB528 10852 bytes
SHA-256: a42ea291fc963bb12389501a47c6ac4bd0914af14a9a40cb5bd40819c7631c67
font_01_sfnt_off0000cdeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDEB 15056 bytes
SHA-256: 28ca58c1fc510f25e9f4ecedb367b8ed472b6b67a552d8187bec24043c07a147

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