Malicious PDF — malware analysis report

Static analysis result for SHA-256 6835ecc3996756fd…

MALICIOUS

PDF

56.5 KB Created: 2020-11-30 10:01:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61b17d98ebbe8e718eb2f558fd33a55d SHA-1: 2ed694d1a991d91b87648eeecee922baba8fc97d SHA-256: 6835ecc3996756fd60c09bbc2a85269abe572585c30875ba6b612d5af111deb4
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many of which are likely part of a link farm designed to improve SEO for malicious content. The primary URL, 'https://traffnew.ru/wb?keyword=free%20vpn%20unlimited%20proxy%20master%20apk', suggests a lure related to a free VPN application, which is a common tactic for distributing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8224

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/wb?keyword=free%20vpn%20unlimited%20proxy%20master%20apk
    • https://cdn-cms.f-static.net/uploads/4368949/normal_5f88bc4f04d7d.pdf
    • https://cdn-cms.f-static.net/uploads/4390350/normal_5fb9a7928b7d2.pdf
    • https://cdn-cms.f-static.net/uploads/4455380/normal_5faed86244c4e.pdf
    • https://cdn-cms.f-static.net/uploads/4370560/normal_5f9a0120b5821.pdf
    • https://zibeselev.weebly.com/uploads/1/3/4/1/134131471/9543740.pdf
    • https://cdn-cms.f-static.net/uploads/4451750/normal_5fa7c2272d61e.pdf
    • https://tavikumor.weebly.com/uploads/1/3/4/4/134476146/jemoxolijoru.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc0078111f6a4198480da42/t/5fc365d5f81c9a2a0c0d9b80/1606641110458/escape_from_freedom_quotes.pdf
    • https://uploads.strikinglycdn.com/files/13f9fcf2-4795-4944-9c76-d409cdc28366/xenepugonubirofexavepuzuf.pdf
    • https://static1.squarespace.com/static/5fc1210ec89e1c4b8fbfc3b6/t/5fc3595c3c6ccf69f3c91b84/1606637917134/unix_screen_cheat_sheet.pdf
    • https://uploads.strikinglycdn.com/files/0040fc38-2b10-4568-a9df-23162c81fb24/sas_and_find_function.pdf
    • https://static1.squarespace.com/static/5fc0e99fa13a450babf41659/t/5fc121ca9ee0f32b877b6239/1606492619581/zavomefisa.pdf
    • https://uploads.strikinglycdn.com/files/5a198798-28ac-4f7a-b13c-f1c6981babed/motebov.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bdfb.bin
b611d168b28a0981a45dd79531d2ef6b3cbfdcdc3f555d557909a831bff14157		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBDFB 5352 bytes

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