Malicious PDF — malware analysis report

Static analysis result for SHA-256 d31d1a1da240c964…

MALICIOUS

PDF

86.0 KB Created: 2021-09-14 13:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 09fe57e17131c3e211ef6b3268ced245 SHA-1: b64fd7e781e48179521604989cf02d2e57aacc92 SHA-256: d31d1a1da240c9645d7afa2df325d041d6cd701c05e0c994b13fcb31f4b538f4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic firings point to the document acting as a link farm, directing users to numerous other PDF files hosted on various domains. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest a potential for further exploitation or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://tovicetour.com/FileData/ckfinder/files/20210911_422288D42DAF3C4A.pdf In PDF document text
    • http://beauty214.com/uploads/files/202109080648215969.pdfIn PDF document text
    • http://birdwatching.sk/media/file/xukaz.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/59544554049.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/39776441527.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/19664297425.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/45932692383.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16138017c07575---53868536583.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/wajudipowopusodedepalinu.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/dogokisaparet.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/28797794850.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/89118563650.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/69920627057.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/87459958228.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/difowitupotoxipuj.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/9935729053.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612eece88206d---99161892317.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/66814721218.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/wixosemunazewofub.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/71173409476.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/peraragimon.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/fipiwirevopodegolosuti.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/46002645174.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kajojemububugafazomifim.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/zezibasuvas.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/dusolakowo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=wizz+app+make+new+friends+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA68 10744 bytes
SHA-256: 0f7a065ea3a82295acca5935f1051bdc223e905ac088ca0e3ce83858845db154
font_01_sfnt_off0001032e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B40 18096 bytes
SHA-256: d0c2d81ced3cd1e69955eb236aeffbe96ece484344343567946ed546753eb184