Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5378f1f1e3821b9…

MALICIOUS

PDF

80.8 KB Created: 2021-09-22 22:32:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1b3522bc91b69df369c792759559f865 SHA-1: 13f927709eaf98fa648a9cb1f39446e625c60586 SHA-256: d5378f1f1e3821b9f8613e2f485d324635567756585256b43346de2e8677a555
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm with numerous external URLs. While no scripts were explicitly extracted, the PDF structure and the presence of many links suggest an attempt to lure users to potentially malicious sites, likely for phishing or malware distribution. The primary attack pattern involves directing users to external resources, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://prakseologia.eu/userfiles/file/54430066505.pdf In PDF document text
    • http://coiffurenais.com/userfiles/file/sirab.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/dufonogurobolimanove.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/jonobimefeguxud.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/2964864903.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/fetofiwogelekogebeludir.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/mumosumiwonasoxurogelo.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/fiviwubipobuvifej.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/5400223222.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/60740880199.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/56157662726.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/46876008161.pdfIn PDF document text
    • http://thuannam.com/image/files/96683414619.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/xuxokubujeporebobozomitu.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/91150408145.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c104cc0b28---dodeniwutuvofegewele.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/84234431191.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/kepuvozepiwolu.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/40337518667.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/kemagukiwebonop.pdfIn PDF document text
    • https://bagstyle.uz/images/file/mutuderezejo.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/kilumotatubonilafex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=wps+connect+froxPDF 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_off0000d80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80E 17960 bytes
SHA-256: 0b073e3f8b41208516822b85439d28c6d3e581513f218864c792ebc5e4c9bf4c
font_01_sfnt_off0001062e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062E 10268 bytes
SHA-256: bfedd734c01cb78ee01ce14e72a365fe50d9af8cb83363e0cdccdfd8be37e5af
font_02_sfnt_off00011d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1