Malicious PDF — malware analysis report

Static analysis result for SHA-256 d03d63bfe28554b0…

MALICIOUS

PDF

71.5 KB Created: 2021-09-25 13:21:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7ef89a11e4c8179ec326345be08add6b SHA-1: 8a6d80715dece1268a8587859dd92f828d17dd40 SHA-256: d03d63bfe28554b013c7e2dadc3620021da3a39d4077581d704b02be760d76d1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to potentially malicious PDF files hosted on various domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for link farms, suggesting an attempt to obscure the true malicious destination. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristics suggest the PDF is likely a lure for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/ruzunuludaditodileku.pdf In PDF document text
    • https://efnnma.org/files/file/46922978634.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/87773579814.pdfIn PDF document text
    • https://otomatcilarmetal.com/otomat/upload/files/27519620527.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/81156592454.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/farasidajonipasinew.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/32776607154.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/85070481138.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac42b84c3c---duxifaxavatumunase.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/ratefo.pdfIn PDF document text
    • https://praktijkbinnenstad.nl/file/jexozujarodop.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/3fccca2e45b440789ea05c49f54f765b/duvedugonu.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/80252553477.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/vofapilidifesewukoxarawux.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/somomobitinegug.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/67639474608.pdfIn PDF document text
    • http://medicareclinichowrah.net/faboriginelist-braj/userfiles/file/49697522257.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/63600106121.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109040053013145.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/wotowubewumetusemoker.pdfIn PDF document text
    • https://songiadahoaian.com/upload/ck/files/6721427639.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/balunuloze.pdfIn PDF document text
    • https://www.confirmedtour.com/files/3107753652.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/rokefoduzodinudedudawepim.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/38510175408.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=balancing+equations+worksheet+gcse+pdf+with+answersPDF 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_off0000b4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D5 11376 bytes
SHA-256: 700a0fbcf5bcc9e63f66880d3d61358483e5f8427ef5790ace7af15ca06b9dad
font_01_sfnt_off0000cf30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE742 16088 bytes
SHA-256: 5651afc8896680b0d8ffe292b2c6210f19546da597a5de44a62167d188eca1e9