Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac1ff7d58f874db0…

MALICIOUS

PDF

71.2 KB Created: 2021-09-17 09:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4f44fac3541ad46fa5ac52e6213f0af4 SHA-1: f1ca3ac6245a59e526422c0f0322401c8e611d0f SHA-256: ac1ff7d58f874db0efc25058018d268b035cbd996e9a081eda367680f51d2e2e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to other PDF files hosted on a variety of domains, many of which appear to be disposable. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high number of distinct hosts suggest a deliberate attempt to obscure the true destination or to distribute malicious content through a link farm. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. The file likely serves as a lure to download further malicious content or to phish user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://medvor.ru/uplcv?utm_term=thoptv+download+for+app PDF link annotation
    • http://a-pluset.com/userfiles/92849955965.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/jijipixomifa.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/mevorajufoxunopoxewogu.pdfIn PDF document text
    • https://noddy.nu/images/file/matolafuwapelovawuzavubeb.pdfIn PDF document text
    • https://iphastkala.com/userfiles/file/40904214112.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/56k2icsgkltrgikjv6foo6l592/31071536387.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/86721572765.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/75484646675.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/qt41s92lpk3fgicueprtpc7tjk/85299314559.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/dolisulupofokoto.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/39526234512.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/petifilawipitoxeb.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/vomagexanidasuxetor.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/24248103020.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/kekufexomefipulo.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/kigasavumitukesezuw.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/61223811482.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/lakebisov.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/lupagumukilafopomirijepe.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/68129914621.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/pebawigitadamu.pdfIn PDF document text
    • https://swiz.eu/files/editor/34608764109.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/bepexagupo.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_off0000b4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F7 17024 bytes
SHA-256: 323b913efe12d84dcaaace7c5d4444558615a22db1391c5f22b3c9ebb1658476
font_01_sfnt_off0000e030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE030 10316 bytes
SHA-256: fc59b06bd085fbb3fc112dd7632ebe7bda92af23af84f1569c4367cac2684e47
font_02_sfnt_off0000f76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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