Malicious PDF — malware analysis report

Static analysis result for SHA-256 b051b62d770c6a6c…

MALICIOUS

PDF

75.8 KB Created: 2021-09-15 18:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e347d22a6c68808f632a42381d33dd1b SHA-1: a318e42d5d9b8a0db4157a370ef957787e09a78a SHA-256: b051b62d770c6a6c6b4b4ff5ad5932d9c7421dea1920eb32cbdca32840ce0e9c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous extracted URLs suggest the document functions as a link farm, likely directing users to phishing sites or malware. No scripts were extracted from this sample, but the overall structure and heuristic firings strongly point to a malicious document designed for user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.jindatunnel.com/up_files/file/zulam.pdf In PDF document text
    • http://saothienemb.com/uploads/images/files/feruruzugidilibuxoxejapaw.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/64121531597.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/xagugatulixizigagumanek.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/50820262242.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/72279076648.pdfIn PDF document text
    • https://clickbox.ro/images/file/merula.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/15866045954.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/wofiwigatoduxuwituseluj.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/e1bs2ek6ol7b9g73ieb1vh6d7g/4324496519.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/zegigibedewobazorijeto.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/66033569929.pdfIn PDF document text
    • https://superpart.com/files/viboma.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/12883259813.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161413a5a87048---zesusizuvovoli.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/18026921272.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/23874542626.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/vusoruzoxupafo.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/78892071387.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/18547054025.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/72147608917.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/pekuxozevoda.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/daralo.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/13327006429.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=watch+lucifer+season+5+part+2+onlinePDF 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_off0000c1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D8 10924 bytes
SHA-256: f26b5938c7f2c187191dc7a0c52353538eba04e1d0627c8815c619e1d2154c81
font_01_sfnt_off0000db3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3D 17568 bytes
SHA-256: 97599032c26d1c062ce3dc5e42d60ed77abee9bbcf5fc84c5614f756390e8c52
font_02_sfnt_off000108b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1