Malicious PDF — malware analysis report

Static analysis result for SHA-256 aba351e196c36730…

MALICIOUS

PDF

81.3 KB Created: 2021-09-13 22:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c5619803205d9cf33ff1c8c21255ac65 SHA-1: b1638f39b4de898e8188e17d31367d045497841a SHA-256: aba351e196c36730635a06229db49657f9ac312a797a1724c5bc635ccd852f93
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, with a significant number pointing to disposable hosting and acting as a link farm, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the true destination through multiple redirects and potentially deceptive link structures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cructi.ru/uplcv?utm_term=fnaf+fan+games+unblocked PDF link annotation
    • http://bjerkelunden.org/content/files/userfiles/file///82059338125.pdfIn PDF document text
    • https://retta-bg.com/userfiles/24624063408.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/difejitopomemirexati.pdfIn PDF document text
    • http://ljsmelt.com/upload/files/57472659024.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/25167083816.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/39624805164.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/9053539130.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/9480233299.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/23194033741.pdfIn PDF document text
    • https://badrivishal.com/media/58219832926.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/14573413585.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/vivaw.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/nebiresitodefev.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/lexizixewaxutivajekum.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/69478659163.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/32677712874.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/lagevobirekodujiw.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/75908977048.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/jikuzosuborilepanope.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/kerefofiderefof.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3a8f22050---wuziforuziropegepur.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/98932257129.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613aebce6c4cc---vaposovejimowujewaludefog.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/23406698216.pdfIn PDF document text
    • http://perfecturology.cafe24.com/upload/editor/imagefile/46076348102.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_off0000da8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8D 16868 bytes
SHA-256: 22e044a8cee37887894b0bed1036c0ceaa1ee897b0a48721458c192b46737c06
font_01_sfnt_off00010631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10631 10836 bytes
SHA-256: be13b8d8f480e658535c7d72ce197bf64974851cabf5bb04515343c286df9615
font_02_sfnt_off00011f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1