Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3e63c25d8b03ada…

MALICIOUS

PDF

84.4 KB Created: 2021-09-13 15:35:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 18a2befb536adcbcb2a259b56c333a0f SHA-1: be64c09c24079fa355abe9c3337dc9db9ef8aa9f SHA-256: a3e63c25d8b03ada6b0f5e6f398fdb54ec3f2676ddaa58b7395b0d6385606df6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier returned a high probability of maliciousness. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or redirection attempt. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://xyoaa.org/sites/default/files/files/nezat.pdf In PDF document text
    • http://czerwoneiczarne.pl/files/file/31892119627.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/fubonovizoziwev.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/duvavugusarekotez.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210908_102234.pdfIn PDF document text
    • http://kco.su/userfiles/file/91169570331.pdfIn PDF document text
    • https://loyd.rs/images/file/48661059017.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/39091392423.pdfIn PDF document text
    • http://kelt.pl/userfiles/file/45479655538.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/48626059613.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/sisosakup.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395b7a0947f---vezosotetixakub.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/14830807251.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/41973540707.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/dekevew.pdfIn PDF document text
    • http://kyea.org/imageuploads/popuji.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/makejim.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/ropobatapiwezapokesavib.pdfIn PDF document text
    • http://citra.cl/userfiles/file/rorexufusiwonipuda.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/letutomanokimiwumenu.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f2728fdeb---80443217663.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/voxibexazol.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/32462776209.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/35912212299.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/46606971904.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=world+community+grid+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_off0000e27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8F 18768 bytes
SHA-256: 5beb1ccddd93f774f005e773902ac9287504d2ed43200ddae0618010ef6789fb
font_02_sfnt_off00012c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C36 10620 bytes
SHA-256: fc51fb2801527a2479ca4b5edee9ef7b858d68ac98545fdca51009b08e4a78da