Malicious PDF — malware analysis report

Static analysis result for SHA-256 18b75deed95bab67…

MALICIOUS

PDF

69.0 KB Created: 2021-02-20 21:45:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a2a9fe9c4778cadc510dadcad3425b5e SHA-1: ea6d6d3ff3c6c97904fa713f5cdefec35dff16c0 SHA-256: 18b75deed95bab677ff9eede90aed1f1bf5a78ced14372e4fbcf2cb171e9188f
96 Risk Score

Malware Insights

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

This PDF document was identified as malicious by an ML classifier. It contains a large number of embedded links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The primary external URI points to a search query related to sewing machine problems, likely a lure to drive traffic to malicious sites. No scripts were extracted, but the PDF structure and numerous external links indicate a phishing or content-farming attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://bologen.ru/wb?keyword=how%20do%20you%20fix%20common%20sewing%20machine%20problems PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4491669/normal_6018a6cad0185.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462066/normal_5fe18c12c7744.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487419/normal_5ffd292ad66f0.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisitixinu/Pjd5hiw/xojunigubikifuluzetureser.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450733/normal_600ded5ed1f18.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426541/normal_6004ffc5a16d9.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/hcSWidZ/jokax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420039/normal_6018f6a67d9e0.pdfIn PDF document text
    • https://cdn.sqhk.co/xivovido/VLnqjjh/32520602151.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460688/normal_6011ac31b9372.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420039/normal_5ffa930e6149b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447884/normal_5fd391196899e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455881/normal_5fde7e234cac6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374954/normal_5fc7f5d9bd328.pdfIn PDF document text
    • https://volifutizur.weebly.com/uploads/1/3/4/6/134602954/mozowo.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_off0000cf6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6F 5932 bytes
SHA-256: 36557c5ac695e8f7dc6b4a68b3103ee82bd91c01dd665f396b242a3957f55e74
font_01_sfnt_off0000e392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE392 10276 bytes
SHA-256: 494558b3a4f21c63c67f8ec0a432a2007e3d510cb37dd40383b8e55db96629be

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