Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b88175c30d28a1b…

MALICIOUS

PDF

61.7 KB Created: 2021-09-15 18:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a9dd9f763ef3af8f0741d9363d1226ef SHA-1: 2f2b80a146175e4db49425b097a6c23f221e0676 SHA-256: 3b88175c30d28a1b4e38dfb4fb74323fe4c862ae75eb95d74cb70faa7c199c14
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to potentially malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving phishing or the delivery of further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious nature by identifying the PDF as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5428

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://pixomot.ru/uplcv?utm_term=5000+toefl+vocabulary+list+pdf PDF link annotation
    • https://sofupingame.net/calisma2/files/uploads/toxaviroxowufujid.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/fuxusopobo.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/28104657127.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/85098477964.pdfIn PDF document text
    • http://yuli-china.ru/d/files/virijinimar.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/920df6d3cd5fd0b4c9b9f4ae07b2ea3e/81940412452.pdfIn PDF document text
    • http://levotst.com/uploads/files/79376129871.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614175b4d7762---wekixofudonatigina.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/83020678686.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/masupar.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/likitizorox.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/16266271863.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/vupaxisaj.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/10120395556131aca34bb13.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/sezomuditabixifugur.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/sunekawojutufu.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/gudilugibitipewe.pdfIn PDF document text
    • http://www.farnostbobrova.cz/ckfinder/files/88681799936.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/38073772346.pdfIn PDF document text
    • http://otohyundaidanang.com/uploads/image/files/38946194502.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/83636322542.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/86531363740.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/wafigajepimonaleka.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_off0000b1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C0 14740 bytes
SHA-256: 5c045f4b932e7a41ae6cd19f29c94d1bef23e288cbd67f25f6c3db8dd782e075
font_01_sfnt_off0000d671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD671 11088 bytes
SHA-256: 59cbdd38146d0c9873aacf9e627f585e85987183de25a879d3b9dd7946411784

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