Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f6f41337145c4a…

MALICIOUS

PDF

69.7 KB Created: 2021-09-26 05:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 679c84c20a662ce6d567cb817b98b50b SHA-1: 2f62ae4eb7f03fbdc03f265fae546561a9f8786b SHA-256: 90f6f41337145c4ac7ae668be83ee820e5205cbaac3653ff80a540fdcd8b169a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many pointing to suspicious domains, and is described as a link farm. While no scripts were explicitly extracted, the presence of embedded URIs and the nature of the heuristics suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74347021347.pdf In PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/66573509895.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/49196360776.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/tilafav.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366a62543e1---vireju.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/pusodeguwalaxoxun.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/kanano.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/6926074907.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/7463952028.pdfIn PDF document text
    • http://esistore.de/userfiles/file/varejasosufeja.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109141647249031.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/24812232465.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/xozetaseguvovinoguta.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///30345749617.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///12776082324.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/74755102380.pdfIn PDF document text
    • http://yonetim.e-cari.com/upload/files/4512692708.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/mipisubaxaropalofeviwabo.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/46254215759.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/39675878861.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/tajagilipodurewopopo.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/fusadanexekemu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=android+backup+contacts+and+messagesPDF 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_off0000ad01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD01 17376 bytes
SHA-256: 676d0c28cc48e3de7e601eeac0d6688b6b2da6a62f8ba53c62333e8a6c332d8f
font_01_sfnt_off0000d7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A6 11124 bytes
SHA-256: 705294f688d9bf641fa7761cb02b3d2e96f6433ab311dccde5478c383fdf66b0
font_02_sfnt_off0000f141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF141 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1