Malicious PDF — malware analysis report

Static analysis result for SHA-256 96cdb5dbe1c32e10…

MALICIOUS

PDF

82.2 KB Created: 2021-10-11 03:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 024160a58ebbd1ed915212747f7e4eb4 SHA-1: a49699eae7ebf39aea0e4b2187576c6b92a1eee9 SHA-256: 96cdb5dbe1c32e1013f5d900da9352f1211b0b932f875990c284f2c88cbe3a7e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains and acting as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to lure users to compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=world%27s+largest+and+highest+valued+semiconductor+chip+making+company PDF link annotation
    • http://picassogift.com/Uploadfiles/files/69756791701.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/49157503909.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/84271567559.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/wajosafikiwuxiwimu.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/23179267983.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/76401484132.pdfIn PDF document text
    • https://whitesal.com/data/images/file/3641_20210924082741.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/tivumavoka.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/vevabigefuzadaxodobuvexi.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cf1d5d4238---64998311969.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/xopiduzogufepi.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161454101009e9---nudafasonederatijerubuwe.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/fejibikotudimagopipuwiwo.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/milazorefepubobiruko.pdfIn PDF document text
    • http://videocycling.info/files/file/67150390372.pdfIn PDF document text
    • http://sake-tori.com/images/library/File/67528005028.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/kavazazimile.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/11838000568.pdfIn PDF document text
    • https://oasis-travel.ro/files/71244579384.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/49307295506.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/nubabimajujuzimodel.pdfIn PDF document text
    • http://espicycooking.com/files/file///dosofagevomikavamow.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/6856806167.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/14068395567.pdfIn PDF document text
    • http://royalgroup.at/tmp/mugevuritolikixixikadeluw.pdfIn PDF document text
    • 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_off0000d8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D6 11360 bytes
SHA-256: 56f05062d715a49574f9bf5e35d8e648b4b7ea612e8767d809e16e5d576881d3
font_02_sfnt_off00010b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B40 18140 bytes
SHA-256: 7027aa8243cafc2542f772b5b7dc0b867f2107f18ce28728a0a959c63a153713