Malicious PDF — malware analysis report

Static analysis result for SHA-256 b31f1f595d45520a…

MALICIOUS

PDF

66.6 KB Created: 2020-12-13 14:23:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 836743df9b1c295516cb6acd5494215a SHA-1: a3bd339b429e42a0f3fd62efedc6ca40785ae279 SHA-256: b31f1f595d45520a03d503d6962fe38b9fe9363b61a365e08d70fbff0d77f8aa
152 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the presence of a malicious URL points towards an attempt to redirect the user to a compromised site for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8551

Heuristics 3

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://cctraff.ru/strik?utm_term=brick+weed+thailand In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380076/normal_5f98d334268eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464083/normal_5fb3734781e18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469105/normal_5fbeafc39c966.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448341/normal_5fbae937ab7d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387817/normal_5fa39fe693f86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391317/normal_5f922f40dc899.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386609/normal_5fcdae087117e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383160/normal_5fb5332041c7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378379/normal_5fa63e9355620.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/mesotodimus/bhajan_song_site.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/77010823971.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/zuwawisupopixixudu.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/catalogo_de_bujias_ngk_2017_mexico.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/bukozumitixot.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/zewibesapexavi.pdfIn PDF document text
    • https://s3.amazonaws.com/kuboki/15911157186.pdfIn 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_off0000f09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09E 5056 bytes
SHA-256: 42570886e1f14594520f162e069dd913a9d847e7c6439919543b7d30be23322d
font_01_sfnt_off000101d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D3 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0

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