Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c52f720f844838…

MALICIOUS

PDF

41.5 KB Created: 2020-06-23 22:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b00d244374d0052a918753eca332c8b3 SHA-1: 3b79df1cc40ba8ef527afae924098f58700cffcd SHA-256: 55c52f720f844838d4ff4c9f6197397104d19672c5d98492b5036a04adb0e77c
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier as malicious with high confidence. Static analysis revealed a significant number of embedded external links, a technique often used in SEO poisoning or link farm attacks to distribute malicious content. The document body contains obfuscated text and multiple URLs, reinforcing the likelihood of a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 3

  • 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
  • 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 http://wyeintheskyrecords.com/uploads/1/3/0/5/130540104/130540104.html#speaking+test+pet+pdf
    • http://davidsonconcreteconstruction.com/uploads/1/3/0/4/130483852/6451749f.pdf
    • http://demservicesautomobiles.com/uploads/1/3/0/5/130590538/vobopigagef_sikajomebegurix_lixerowaje_rajuvalitodi.pdf
    • http://buggy97.pleasingfood.com/uploads/1/3/1/4/131409463/1081397.pdf
    • http://mta-sts.mail.mitarbeiterzufriedenheit.ch/uploads/1/3/2/6/132681245/gejulugozinebibe.pdf
    • http://sustainable-summer.com/uploads/1/3/0/7/130775182/675785.pdf
    • http://mta-sts.pawsandhandsunited.org/uploads/1/3/0/5/130550824/vevulifuti.pdf
    • http://thelearningagencylab.com/uploads/1/3/1/1/131163516/zozexoroxerabipiwud.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006456.bin
da48773599b5c64167fecc06ea49d2110a4065fbabddabfe6f37c3e9d8efdd90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6456 4928 bytes
font_01_sfnt_off00007526.bin
3c42189f784e4bee7717caf7bd4f7e3dd5f9f2580a84b0d71c0bcbfe5dc97d21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7526 10832 bytes

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