Malicious PDF — malware analysis report

Static analysis result for SHA-256 4440f51cf6737d2e…

MALICIOUS

PDF

76.4 KB Created: 2021-09-10 08:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7b298984522ecc033b412f9b59a386ea SHA-1: 48eba3b950b9cb64325acc664124f805735f5888 SHA-256: 4440f51cf6737d2edb5b40c82223dba7a361c2092a5516ec0751287dd6fd5728
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs pointing to external sites, many of which are hosted on potentially disposable domains. The presence of these links suggests the document is designed to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9757

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 https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d34d1a3a1---wukoj.pdf In PDF document text
    • http://studiopignotti.it/userfiles/files/xigitexiro.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/13838253790.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/33643672714.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/23539436935.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090603290060.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/zofidoreleraverop.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/58001702945.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/48922692694.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161315ea8e7ca1---nupekomamujixi.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/23980825588.pdfIn PDF document text
    • http://opersan.com/file/lezudixaturipo.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/zoragovufodilokimuz.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/tazowutapigodiwe.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/goxokuri.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae77492403---33029115417.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/butovasirikefukipubovoxik.pdfIn PDF document text
    • http://freestyler.cz/img/file/mukujaf.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/68561155774.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/wifizejiguxepuz.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/pelago.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/veluperazatuxel.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/puzizasakomam.pdfIn PDF document text
    • http://lawngo.net/fckfiles/4033240694.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/85421299471.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/bokukifexebel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=download+pokemon+drasticPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB385 16768 bytes
SHA-256: ae0e4a2128f4211b5982f91ceff08b7668162bc31dd978a4781c3a4ecc545439
font_01_sfnt_off0000dd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF533 10856 bytes
SHA-256: b0acd10a53ec5abd1805c02680ea5eb04e1c8b5b3a3058fec6c783dd8f5e8b3f
font_03_sfnt_off00010e49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E49 16124 bytes
SHA-256: 2c21ff3ceeb7a5749d3d52712a08aca31fcce6c6a030d08a19a294d8f4050a43