Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cc94d8044cebf80…

MALICIOUS

PDF

71.8 KB Created: 2021-09-18 20:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f544a6930f778659bc5104cc4b63b852 SHA-1: 6483e0430743819c1ef51c1e8964b30827fec4ea SHA-256: 1cc94d8044cebf808f4621f17a08243273eec0de2a656cb18a5be198275671fc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to malicious content or download further payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate attempt to obscure the malicious intent by using numerous disposable domains for redirection. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=no+root+firewall+download PDF link annotation
    • http://7seapharmtech.com/Uploadfiles/files/6823109191.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/xupetoxuzamukafopugis.pdfIn PDF document text
    • https://laps.pl/userfiles/file/37969172980.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/66863725890.pdfIn PDF document text
    • http://gabortech.com/admin/file/62823918883.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bd871a340---zevagotusa.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/36544536311.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/nixufad.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/tizisumasafujiguzokizeki.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/mizepi.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/dabuk.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/farila.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/4090526133.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/vugasegojowogabibamo.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/rerejajanajupujowov.pdfIn PDF document text
    • http://methese.com/upload/files/siritevav.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/8924514008.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16136ca848dbb1---55897321381.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/labaxisujozotodixe.pdfIn PDF document text
    • https://interconformity.ro/images/file/53221626004.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74155899991.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/nalomidajorisixidapana.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/bonavotoluduferufif.pdfIn PDF document text
    • http://annabarons.lv/files/files/vovewom.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/85346452402.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_off0000b827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB827 10244 bytes
SHA-256: 36a097cc764145e565ecb35b06427c559dc2d97e8ba26ceb3da6db4dadad7dd3
font_01_sfnt_off0000cf4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4B 16344 bytes
SHA-256: fa65a0bef308b4103514df3f6b1d56e48c09254c98e6a2ec16df9b169a6c6687
font_02_sfnt_off0000f9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1