Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a9b4c2592df873…

MALICIOUS

PDF

74.6 KB Created: 2021-01-03 02:53:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 79ea0792a4796f181d6f8b2646262267 SHA-1: 1c2aed56a1aeeb237d3df03231bf121f46fd12c4 SHA-256: b0a9b4c2592df873a012bfbb795dcba617880ad4522dc1e6fcf35a65c06ad693
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, including a known malicious redirector and a link farm, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/aws?utm_term=catholic+hymn+sheet+music+pdf In PDF document text
    • https://zefipomez.weebly.com/uploads/1/3/4/8/134882075/tugemadaxenofa.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/dgihgdB/assistant_manager_jobs_nyc.pdfIn PDF document text
    • https://kavosimodo.weebly.com/uploads/1/3/4/9/134901779/pogafubujobuja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384839/normal_5f8d057646145.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480594/normal_5fa75c6311d77.pdfIn PDF document text
    • https://cdn.sqhk.co/pugusomimoro/hhwijg1/neruwiropowuraxozojew.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/xafaxotaful/ambassadeur_6000c_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b61aaf2-01e9-43c3-821d-9d87fce43b8a/75832434330.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9853c41-8da7-4393-97ca-0b5ba0447542/honeywell_thermostat_manual_rth111b.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/31610793098.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05bffb85-a11b-41e7-898f-f8557ee2f59b/kart_stars_mod_apk_1._12._50.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_off0000e623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE623 5304 bytes
SHA-256: f02dd8cf051e2dfbcc8ecc5302f4bc59cdeba86e928cbc0c013f88f0e6003e2e
font_01_sfnt_off0000f816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF816 11308 bytes
SHA-256: 525e4699ffc04d697bb037ad240af8020a87aabe7edbba06195eb5386f7d22aa

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