Malicious PDF — malware analysis report

Static analysis result for SHA-256 e517934ddd2a1a83…

MALICIOUS

PDF

72.9 KB Created: 2020-11-25 08:50:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 9b8ca7f3e830c5802a397eab69f6f48b SHA-1: 9ae1c81fbd79b27a8dd642a8f1df6c37c0b749bb SHA-256: e517934ddd2a1a8319ce161ba7514365fe939aeacfa141c4e2cdf125b7675d69
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://trafffe.ru/aws?utm_term=extractable+and+leachable+guidelines PDF link annotation
    • https://ginixogigifigat.weebly.com/uploads/1/3/4/3/134367444/f205ee89f6.pdfIn PDF document text
    • https://xomivevisavuwog.weebly.com/uploads/1/3/4/8/134852088/ed8434.pdfIn PDF document text
    • https://sulajaxa.weebly.com/uploads/1/3/4/3/134362611/476419a7e0859a.pdfIn PDF document text
    • https://pamukisap.weebly.com/uploads/1/3/4/7/134761215/niwafumo_futador.pdfIn PDF document text
    • https://posukezeke.weebly.com/uploads/1/3/4/7/134746748/356f69a.pdfIn PDF document text
    • https://finiluxexolije.weebly.com/uploads/1/3/1/8/131856594/kulupegobewo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487413/normal_5fab66b2f2d3f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/format_for_certificate_of_completion_of_project.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/html_css_website_templates_with_source_code.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/pneumatic_conveying_system_design_calculation.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/compound_probability_independent_events_worksheet.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_off0000dff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF8 5368 bytes
SHA-256: 93f229cacdf6c173c1d5942c262f7f8599aa99079d3ed3a79296d5a94fa573c2
font_01_sfnt_off0000f22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22F 10756 bytes
SHA-256: b6659fc8e4bafb49a4861b3a603f2fac69577bdac57999529eb613c2c4bf84cd