Malicious PDF — malware analysis report

Static analysis result for SHA-256 fde93509ec9b1251…

MALICIOUS

PDF

46.9 KB Created: 2021-01-02 06:17:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c561385f719d92c6df47c20a1d14400a SHA-1: fdaeaad4d3c544f196535b1f223432b16c5665f1 SHA-256: fde93509ec9b12513ecdc1678b753600bb58f438a185f0baafd6788fc499d1ae
154 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO link farms and phishing. The heuristic PDF_SEO_LINK_FARM indicates a mass of external links, with one pointing to a Weebly hosted PDF. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains a search query that likely serves as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7770

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://traffnew.ru/123?utm_term=74+cm+in+inches+in+feet
    • https://wimixexaselu.weebly.com/uploads/1/3/4/3/134324609/9226829ad41e392.pdf
    • https://static.s123-cdn-static.com/uploads/4394061/normal_5fc8b3f0e1786.pdf
    • https://cdn-cms.f-static.net/uploads/4369138/normal_5f8a51a337735.pdf
    • https://losepubi.weebly.com/uploads/1/3/4/5/134502138/1443278.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kevava/ireport_plugin_netbeans_8._1.pdf
    • https://s3.amazonaws.com/zedudo/44873930611.pdf
    • https://uploads.strikinglycdn.com/files/4b6e4e76-fbef-43a4-aad6-5ac94874bfdf/soybean_oil_molecular_structure.pdf
    • https://s3.amazonaws.com/vukusa/asking_for_contact_information_email.pdf
    • https://s3.amazonaws.com/bidurudilidujug/edmonds_heights_k-12_school.pdf
    • https://s3.amazonaws.com/mudurixo/alpine_route_japan_guide.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aff5.bin
2ed54bfb0f25af8c7605836ede473961173193ece5579ac574874a1942a4f2da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF5 4856 bytes

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