Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7cc81107e1beca1…

MALICIOUS

PDF

51.2 KB Created: 2021-09-28 18:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 081eed7cc6498cb7ae254a3a488ba8cc SHA-1: dfc1650f50f553b2807591897656ded02890798f SHA-256: a7cc81107e1beca1f84ccf13cbedd24cef513d16d8b8e51c4ae610511c33d924
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs an image-only lure, a common tactic for phishing or malware delivery, as indicated by the PDF_IMAGE_LURE heuristic. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the execution of embedded JavaScript to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9001

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 51 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://pistant.ru/uplcv?utm_term=pokemon+heart+gold+soul+silver+randomizer+rom PDF link annotation
    • http://alphamarino.kz/images/news/file/70748188945.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/37265943774.pdfIn PDF document text
    • http://seowonbattery.com/files/fckeditor/file/7023024706152b04befd13.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210905_223502.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386d14b7d94---79508741765.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/vimetuxukafegul.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/7044674114.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/sapoxazovakadeludajedo.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/zibapegif.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/21665593180.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/duwefivov.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614824fdd506a---guvezorosazanam.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/69650027654.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210907041325_b5yn2o.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/jasiwa.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/87607117468.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/92525780369.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/52547225463.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/69346177668.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/xuvojabowodo.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/vojew.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14711637494.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_off0000ac1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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