Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9694236c70a91d8…

MALICIOUS

PDF

93.2 KB Created: 2021-02-23 21:30:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 2d404565a56d993b87ea39db6720a156 SHA-1: 4bf37d68b1dd64f669763d95d04d86fccdf7f416 SHA-256: e9694236c70a91d8fbc482c8e198ea9399682046f7f4aa3061dd81b535016a53
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a large number of external links, suggesting a link farm or redirection tactic. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to lure users or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/strik?utm_term=kenwood+ddx470+bluetooth PDF link annotation
    • http://sabewasarakabi.iblogger.org/excel_kpi_dashboard_templates_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451756/normal_60308f4fc71f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418574/normal_5ff081fb52388.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503874/normal_5ffd82ea1354e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449422/normal_5fe977e1a45b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391642/normal_5fdb3cfa00f56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368996/normal_5fd0fbf1e2aba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481173/normal_6021cd7fc15b7.pdfIn PDF document text
    • https://ganipomadajo.weebly.com/uploads/1/3/2/6/132695424/dakanotovaj-kesapowufi-bonanekaxak-fubajedaravepev.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/tevigotu/98739614921.pdfIn PDF document text
    • http://gagutaxu.rf.gd/rakupemi.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/broomfield_soccer_club_uniforms.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_off00012d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9E 5008 bytes
SHA-256: fc9bd436a4897b956b4261c14712101ef07a707be254c34dce48bf130c20b159
font_01_sfnt_off00013ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ECD 12156 bytes
SHA-256: f43f0bbbf89c145fbd846f645ee6c1c1e3dc4a735fe81d01509f07008dac3378

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