Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e3de0480333cb2a…

MALICIOUS

PDF

60.7 KB Created: 2020-12-24 02:45:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 753550f5cb7aa56b23cc8b85fb0ac75b SHA-1: 50a077f4e4a8962038bd984a05a58da0d55c931d SHA-256: 0e3de0480333cb2a86ed42e043af40abd7a70b3dac7535a5afdf37b258de007f
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to generate traffic or SEO manipulation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or ad fraud. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://trafffi.ru/aws?utm_term=2011+ashrae+handbook+hvac+applications+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481170/normal_5fb53e745e325.pdfIn PDF document text
    • https://cdn.sqhk.co/diridenafa/ZzjfyFS/gebotonupasijudoduwove.pdfIn PDF document text
    • https://pepomujotopulog.weebly.com/uploads/1/3/4/8/134873529/nuvojuvevupo.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/4189472.pdfIn PDF document text
    • https://cdn.sqhk.co/lewivapawo/QDjbzhc/50411269305.pdfIn PDF document text
    • https://woralolur.weebly.com/uploads/1/3/4/3/134359953/ed1f9c0.pdfIn PDF document text
    • https://cdn.sqhk.co/sofaxuleruri/R67RUVt/ding_employee_app.pdfIn PDF document text
    • https://cdn.sqhk.co/nezafomura/hcMQFgg/75495068273.pdfIn PDF document text
    • https://pufetebad.weebly.com/uploads/1/3/4/7/134711346/50abe3916.pdfIn PDF document text
    • https://fofavaduk.weebly.com/uploads/1/3/4/4/134436242/vazekozilitujej_karuzuvituke_popidupizini.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482023/normal_5fe2ac4f21a0d.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/wuvepilamamuse/87771473039.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/52755969438.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/xavuvinojafidabew.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_off0000aec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC0 5740 bytes
SHA-256: c5c4149c560141a793e6accfb41854ec8cce48d5ec6201c832f8914d6a8b6251
font_01_sfnt_off0000c246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC246 10516 bytes
SHA-256: 8f5366870f0af804ee94e5eed653dee2438fecf846cc4229d7fa066bafe0ea25

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