Malicious PDF — malware analysis report

Static analysis result for SHA-256 051957955654ef50…

MALICIOUS

PDF

69.7 KB Created: 2020-12-21 18:34:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: ce506f9a0a21d6efa8006e4ca68a07d0 SHA-1: df4d4faf7b7024c706c5cefe164daca1bfd596f0 SHA-256: 051957955654ef50c296b52e2c573d73d1e383a73fa429a7d5bb647af2318bad
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common technique for SEO link farms or redirecting users to malicious sites. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics strongly indicate malicious intent. The embedded URL 'https://trafffe.ru/strik?utm_term=top+20+hits+2020+youtube' and the PDF link farm pointing to 'https://kuzogirig.weebly.com/uploads/1/3/4/7/134748708/987bd1eda7b12.pdf' are the highest priority IOCs, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9624

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://trafffe.ru/strik?utm_term=top+20+hits+2020+youtube PDF link annotation
    • https://kuzogirig.weebly.com/uploads/1/3/4/7/134748708/987bd1eda7b12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451930/normal_5fa148a1d7701.pdfIn PDF document text
    • https://mumixiginuwogi.weebly.com/uploads/1/3/4/7/134752923/d4f18e97e424b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391909/normal_5fb9dd791ccad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367940/normal_5fac15230fc69.pdfIn PDF document text
    • https://duzareledibasa.weebly.com/uploads/1/3/4/8/134890493/cf4fb9d326.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373239/normal_5fb4788231154.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf48e29ee0f32b8749bc91/1606371555222/6.2_using_resources_wisely_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/format_factory_for_pc_full_version.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e5b8a3bf4b14aba92f9c/t/5fc48f683485235c86581aaa/1606717307467/6800592648.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD398 4808 bytes
SHA-256: 667ae072501ec075926720db018d118367df7ea860fa30b4cd72e84b63c34e04
font_01_sfnt_off0000e408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE408 10456 bytes
SHA-256: 15d724f445c763b5e68c5917d5b81b0f36ef1222d2e59c5fa5fed820c18929cd
font_02_sfnt_off000107bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BC 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e