Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b5a143495c1ce0…

MALICIOUS

PDF

69.3 KB Created: 2021-09-26 12:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5003796ea1e32fa55659ab17b526fc97 SHA-1: 8a214f33191681b5cbbb4aa0cc536591a1bba6ca SHA-256: b9b5a143495c1ce066c15657433c6418fbd286ce200c984742551565217874d9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a phishing or redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://reafamily.lt/ckfinder/userfiles/files/jawegarekide.pdf In PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/64926719638.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/70135244776.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/kowuja.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/vejejel.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/40332830016.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/xadakigepazizovofarawe.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/30793371976.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/68098872935.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/domokosesezumijukitowaxej.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/pedewibumerupam.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/fowabaw.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/91c43ff0477234a5b7e916d332859b0f/5944817867.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/wumab.pdfIn PDF document text
    • http://dakov.hu/_user/file/lumuzaxunef.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/tizivol.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/23315469222.pdfIn PDF document text
    • http://regiapart.si/uporabnik/file/ziduzifofizovogafi.pdfIn PDF document text
    • http://chineseclothingonline.net/File/55619883015.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/firamunozaxesivumobenop.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/mivasiwunitepis.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/37587920082.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/66483595155.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=redmi+note+10+pro+max+price+in+bangladesh+2021+aprilPDF 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_off0000ad98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AA 15324 bytes
SHA-256: 45e4d8ba05dc69181ab728d295a0978e0c920bbf8eb07253aa9975fa44d875f0
font_02_sfnt_off0000ecc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC2 11540 bytes
SHA-256: 20de3daaeb07efe8088ba11c2f98f1f438e4ce4e7641c6fa31dbf62ac35733a8