Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba639a475124dec6…

MALICIOUS

PDF

73.7 KB Created: 2020-11-25 18:52:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ae68bab5a56adfc3193b46391cab451e SHA-1: d26155eb7ff4c5df29703a2057216adadee548c4 SHA-256: ba639a475124dec6ee2c7263ff06b971df6036e58437d7d543611e265b9d0de2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or malware distribution attempt. ClamAV and ML classifiers also flagged this file as malicious. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious intent, likely to lure users to compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://trafffi.ru/strik?utm_term=visualizing+and+verbalizing+kit PDF link annotation
    • https://pelimabogex.weebly.com/uploads/1/3/4/6/134685965/zazosuzit_vekaxujobusakum_labukenenara.pdfIn PDF document text
    • https://filuvinuro.weebly.com/uploads/1/3/4/4/134455556/368544.pdfIn PDF document text
    • https://kobigaxa.weebly.com/uploads/1/3/3/9/133997295/922899.pdfIn PDF document text
    • https://lufiwusogak.weebly.com/uploads/1/3/4/3/134319395/xatarofolub.pdfIn PDF document text
    • https://dosaremuxabibi.weebly.com/uploads/1/3/0/7/130739916/nowutesesirubutiga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfa727a1-a405-4869-bd51-24648afe9180/vekax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a91611de-234c-4887-b4b6-b07a60df2599/download_google_photos_to_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e9bfaab-b67e-4e50-8be0-dbd3a9fbfdc4/oconee_county_school_calendar_2017-18.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f43e9609-fd08-4868-ae3c-d3dcd6e6d653/jamunuxutaramexosukifozog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11ec62db-e632-4559-96e0-832b7a542cc6/95168869351.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/ratemyprofessors_uc_davis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4a8b5ad-8767-4e3b-ba79-d19c2a00edc6/discord_desktop_notifications_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/415ddc93-735b-4871-b6fd-bf8523b28116/68751544302.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80D 5272 bytes
SHA-256: f7f38bc9794ffa3fa12079ecdefc9308203c26994d870f6bb3a3e4899e9c1ea6
font_01_sfnt_off0000ea18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA18 15156 bytes
SHA-256: 3efbb8041d9d29abb58221594ae41afacd67daf967135e87c27d412c56a223f4

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