Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f3f02a19146916b…

MALICIOUS

PDF

76.8 KB Created: 2021-05-24 22:37:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6017ff3a2e9d91a75453095727730104 SHA-1: ebf689338917c90a79f0148c0e8ea2c05e606a07 SHA-256: 0f3f02a19146916b2a3edc7a339aaaf6e8cc8d173100bef5b050c0350a2932fe
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to 'nipisod.ru/strik', indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

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://nipisod.ru/strik?utm_term=exercices+mesures+de+longueurs+ce1+%25C3%25A0+imprimer PDF link annotation
    • https://vijopafixav.weebly.com/uploads/1/3/1/6/131636601/xurit-lamejefima-safamube-dubugupe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410414/normal_5fdbea7006263.pdfIn PDF document text
    • https://nuxagaselupig.weebly.com/uploads/1/3/4/0/134016775/6468026.pdfIn PDF document text
    • https://raxeruzuk.weebly.com/uploads/1/3/4/7/134743740/6231178.pdfIn PDF document text
    • https://laganavixafalos.weebly.com/uploads/1/3/5/3/135341912/jiwimalopa.pdfIn PDF document text
    • https://wumigativagulam.weebly.com/uploads/1/3/1/6/131637174/munotove.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388065/normal_600eb84ac36e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471706/normal_6049b6eee8ae9.pdfIn PDF document text
    • https://lepovomika.weebly.com/uploads/1/3/4/7/134701686/7726098.pdfIn PDF document text
    • https://doxuginuf.weebly.com/uploads/1/3/5/3/135346615/1534272.pdfIn PDF document text
    • https://wimukevefom.weebly.com/uploads/1/3/0/7/130739067/rojutoj-bevemup-berararosobato-todezogetesu.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/bidurudilidujug/air_force_1_pixel_gold_chain_restock.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/jinja_template_for_loop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f60d4692-554b-4847-b311-36d13f88b19f/zegojurote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfde2636-fac6-4979-bfe3-8735b293e1e4/how_to_make_a_bar_graph_in_excel_scientific_data.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/35139394586.pdfIn PDF document text
    • https://s3.amazonaws.com/pekatikisuruki/46707180782.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f46ac83-c477-4ec5-8013-e4a78a390edc/63589636720.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_off0000e9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AE 5492 bytes
SHA-256: 17590dde58ec821feef969d12a853e7c357e150138410283ccca5fe50897e5a7
font_01_sfnt_off0000fc53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC53 12012 bytes
SHA-256: 7af5a011dac0f685b346cbe1e848777afb665530934840982fa50aa7b904fa08

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