Malicious PDF — malware analysis report

Static analysis result for SHA-256 0315a88ba23aeb64…

MALICIOUS

PDF

67.7 KB Created: 2021-02-17 23:30:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 876310e70a80ecd7f6c48d682b111d7f SHA-1: 88a3512f4cd1bfd17a0aba745dac89454705adb9 SHA-256: 0315a88ba23aeb6480580be2e448e14902e2bf512882b36f83d61729762c60db
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, suggesting a link farm or phishing attempt. The embedded URLs point to domains that are likely used to host further malicious content or redirect users to phishing sites. No scripts were extracted, but the PDF structure itself indicates malicious intent.

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://baarspo.ru/wix?keyword=tone+color+theory PDF link annotation
    • http://digitaltoolsfor.xyz/download_collarless_usgs_topo_maps0wyr2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463298/normal_600dd9a411b7b.pdfIn PDF document text
    • https://cdn.sqhk.co/tisufupujeli/dQ4yV7v/waninimixovukajebatolig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445115/normal_601fee81e62c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490370/normal_6001e6ee7c3aa.pdfIn PDF document text
    • https://nuxowodevuj.weebly.com/uploads/1/3/4/6/134609076/zakuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481418/normal_601a22fa76f4e.pdfIn PDF document text
    • http://7lessons.website/vijodidosibapwg6i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368246/normal_5fd2e10fad53d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369930/normal_5fe3205a3046e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417537/normal_5fe1f2f47a78f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384650/normal_5fe4e1fdc5b37.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491450/normal_5fdfb92234170.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000cfae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAE 4548 bytes
SHA-256: d511e1ed7f146836def7689c72914dd9b7e54254d2ba9ca45a8fec7d9a1a2849
font_01_sfnt_off0000df26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF26 10244 bytes
SHA-256: a30ecca2a7df908c0832593103193c9a76e0562c6a6b708e5fcf7e18a884cebe

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