Malicious PDF — malware analysis report

Static analysis result for SHA-256 4704e97b842c5d36…

MALICIOUS

PDF

91.6 KB Created: 2021-02-15 19:59:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4f79f15383fd54ddb719455732fd8c64 SHA-1: ae52aa3e6889c6d7febe15e473fa78005dfba4d7 SHA-256: 4704e97b842c5d3637ab5923ad80439f287a7cf19f28c3de0f72c08ddad64369
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 by the PDF_SEO_LINK_FARM heuristic, suggesting an attempt to direct users to potentially malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

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
  • 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://maypoin.ru/strik?utm_term=what+does+environmental+ethics+mean PDF link annotation
    • https://cdn.sqhk.co/pivokazi/ggiYihx/top_40_radio_hits.pdfIn PDF document text
    • https://cdn.sqhk.co/mifijizudi/iifhelJ/45181098917.pdfIn PDF document text
    • http://vkysnaya-eda.site/jonujudisamifezo8pg2b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477651/normal_5fe2c232304de.pdfIn PDF document text
    • http://ru-en.xyz/naive_bayes_classifier_tutorialt0275.pdfIn PDF document text
    • http://hhizmet.com/zofebemupuropelepuraw4gz.pdfIn PDF document text
    • https://cdn.sqhk.co/xovujiroveg/dhajmji/life_list_bucket_list_premiums.pdfIn PDF document text
    • https://nokogijesa.weebly.com/uploads/1/3/1/4/131452879/xozekosefabisojo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420939/normal_600966e8cf4f2.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/bevekizadoxuj/78388197068.pdfIn PDF document text
    • https://s3.amazonaws.com/pigolo/duponerorifune.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/feasibility_report_writing_format.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/mad_libs_template_online.pdfIn PDF document text
    • https://s3.amazonaws.com/kegovev/sample_employment_reference_letter_template.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_off00012bdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDD 5252 bytes
SHA-256: 0ecd8a92e8be42eda6ddfe1cf4e94f0676e8a1facd078ae3d445e4dd48831081
font_01_sfnt_off00013d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D9C 10384 bytes
SHA-256: 8b239c5d72ddc5797963b2976d6d34c47ca7fc44387e40bbee80defd948f9e58

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