Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4e4f8557e57ed2c…

MALICIOUS

PDF

62.7 KB Created: 2021-02-27 22:44:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: a15c781ad16cd0a2532855f8029ddc5a SHA-1: c953cca713f97fdb69597c35420a352a7baee475 SHA-256: f4e4f8557e57ed2cb53e17a7467c57df334bd163a7a624d24a39457ed4954adf
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms and phishing sites, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as phishing. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or scam campaign designed to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9729

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://resalured.ru/award?keyword=everybody%2527s+protest+novel PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481985/normal_5ffa17252a891.pdfIn PDF document text
    • https://cdn.sqhk.co/bisidilit/hhiamgd/20003814293.pdfIn PDF document text
    • https://tulovituvo.weebly.com/uploads/1/3/4/2/134234708/2008362.pdfIn PDF document text
    • https://cdn.sqhk.co/kufagilan/0nihchg/modern_warriors_fox_news.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386076/normal_6021f9dfedf66.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/ijhFjjv/rasemeripidefufe.pdfIn PDF document text
    • https://cdn.sqhk.co/kefekawit/xhaNqgi/jekupelutumelif.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwovodegi/eBRiuhi/91544200080.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482617/normal_5fc93f217838c.pdfIn PDF document text
    • https://cdn.sqhk.co/keliziniw/gc59wQL/mountain_bike_freeride_videos.pdfIn PDF document text
    • https://cdn.sqhk.co/degavorofala/jhgjjgc/66232180250.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/kesumasaka/klasifikasi_tanaman_binahong.pdfIn PDF document text
    • http://wenares.myartsonline.com/14063982117.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/basic_letter_of_resignation_template_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/58958727479.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF35 5036 bytes
SHA-256: ccf597771078c1b78ca14c1f3eec888935ebc9167427127e8eb5a1758ba87640

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