Malicious PDF — malware analysis report

Static analysis result for SHA-256 9956b711b3256fc4…

MALICIOUS

PDF

70.6 KB Created: 2021-09-29 03:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cb5dbfef5960ca0332b7fa47ae1f7e3e SHA-1: 2123a791838229d921a7fa4a4c6a11a89d6a2add SHA-256: 9956b711b3256fc485930fb1e65ba19de664f054050075237a8a381d8ab8e140
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to drive traffic to potentially malicious sites, possibly as part of a phishing or SEO manipulation campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 4

  • 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://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/buvilibabukoweweviragobor.pdf In PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e5197e1b0---53824999451.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/36895483412.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/pawitagonuxemuvowakaguti.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1630941673.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/sijemaxuzaw.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/gevijerijezon.pdfIn PDF document text
    • http://school15-tyumen.ru/f/gikederelegikutus.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rubudakodagabopiz.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/2381522119.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/ziporuset.pdfIn PDF document text
    • http://wwstationery.com/files/file/23814997000.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/jazurodane.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/84402484619.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109100321595244.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/7564090749.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/tadomaxe.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/40222269768.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/sorezatorinulonor.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/24171906.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/h7dbdv92ioft57766svti6noun/13404225478.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/58249702229.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/poduvetobemirusa.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/zutazesofaz.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021922210579376.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=boom+beach+hack+private+serverPDF 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_off0000b1cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1CB 10840 bytes
SHA-256: 368867ae036a77b8cfbafe86c1647e1d64c1654887860188c2419d368c81461d
font_01_sfnt_off0000cab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C6 16372 bytes
SHA-256: c893a7a59446361eb06cd624c02719c06a91b08a7effe0cb99ae81df98fc77a0