Malicious PDF — malware analysis report

Static analysis result for SHA-256 add5fb2702c3f5a7…

MALICIOUS

PDF

69.2 KB Created: 2021-09-26 19:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 53be53d457b6b5c524ff81290e13da3f SHA-1: 9cbb70dfe6c611ddb18b958187ce1088540aa383 SHA-256: add5fb2702c3f5a725b0be6219472539cdb88a3b57d37f1ca42da63d19bd6a8a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It functions as a link farm with numerous external URLs, many hosted on potentially disposable domains, suggesting an attempt to distribute phishing content or malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a structure designed for link proliferation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://flynewsletter.com/uploads/file/96109658449.pdf In PDF document text
    • http://lngpetro.com/userfiles/file/degujelixapunozugisova.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/5800158327.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/15002401528.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/binuxe.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/87773579814.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/sovorefuxizexutedo.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150174f3717e---27434196209.pdfIn PDF document text
    • https://blokhol.com/upload/files/tadikofedujobozokusiz.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/dujasumozulas.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/dipeditetufafukap.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/solofiribudusobivuxasujo.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/pawuwa.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/21868388832.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/wewakokuxuxe.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/85450309920.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/10902015413.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/19278265282.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/36911590965.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/sisorawolaven.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/mizamowusonifogarozima.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/wurejirulurujirejubop.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/12620179169.pdfIn PDF document text
    • http://alvitraders.com/files/wajulufow.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/46a0835b55cd346af66094dcdafc0bd0/rijudolazarop.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/12446211624.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=bodyguard+full+movie+online+freePDF 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_off0000b0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F9 14832 bytes
SHA-256: 596c882ee055e99a4553a45d1e8cdc28975630a45a3f8e36e765a3eaa90e4a93
font_01_sfnt_off0000d646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD646 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5D 10764 bytes
SHA-256: 1769a2c276c42ccca494b3b4f08ca9906e31feda1ea0fa0b54604d9c6f4b7044