Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e42f2421d02f5fb…

MALICIOUS

PDF

68.6 KB Created: 2020-11-27 10:09:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a78d41306a2e3eef8a88c8ad34ca3dad SHA-1: e2fd4f442650a01259d92538c810ba236d838d07 SHA-256: 3e42f2421d02f5fbb83be0f7415f55c0e5913535530f36487015d145fa2cb390
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting an attempt to manipulate search engine rankings or redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classified as phishing. While no scripts were directly extracted, the presence of embedded URLs and the overall structure point towards a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://traffine.ru/aws?utm_term=request+for+training+letter+sample+template PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366984/normal_5f9eee7a76a56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384632/normal_5fc06ef51ed94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368950/normal_5fbfb951e6a0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403270/normal_5f995b540ac12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372980/normal_5fa02e39ae28f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383156/normal_5f922fe02b5ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449170/normal_5fa449eada647.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386086/normal_5f913aa61bde1.pdfIn PDF document text
    • https://foderojev.weebly.com/uploads/1/3/4/0/134041652/tesekuluf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377925/normal_5f8d59fc31c49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366366/normal_5f870dd060677.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376610/normal_5f8cf792126da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373264/normal_5f89283979b14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368958/normal_5f88981c20c62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475741/normal_5fa5085b2b39a.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_off0000d00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00B 5352 bytes
SHA-256: ba7e65d16bd5ec7f52a36a46136c8ed6961ced6d451ccdf56128180072d052b8
font_01_sfnt_off0000e234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE234 10328 bytes
SHA-256: c15b2fd637c9a1bf7bfcffe6bd2493ae5739cfa0b4b26903d544b708c297dff4

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