Malicious PDF — malware analysis report

Static analysis result for SHA-256 4818668e07b709f8…

MALICIOUS

PDF

68.8 KB Created: 2020-12-21 04:32:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17e1237cbb0971bacb3b67c74b64c97d SHA-1: 1770f878f2ed018538128c46b86561af506fbf5b SHA-256: 4818668e07b709f8bf40ca02c2193bcf805514d90c3083f95bd286f3c8d8a1e5
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains a large number of external links, with the primary URL being trafffi.ru, suggesting a link farm or redirection scheme. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a phishing or malicious content distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://trafffi.ru/123?utm_term=craigslist+wilmington+nc+rvs+for+sale+by+owner
    • https://dakufosaxem.weebly.com/uploads/1/3/4/7/134771611/3770350.pdf
    • https://bidalafurita.weebly.com/uploads/1/3/4/5/134591929/xonusapuwis.pdf
    • https://bukodebavuv.weebly.com/uploads/1/3/4/6/134657655/4afba26d31ab48.pdf
    • https://gubilipolijig.weebly.com/uploads/1/3/4/7/134707964/4d2e7eae2cb.pdf
    • https://tedumevoseviman.weebly.com/uploads/1/3/5/3/135311532/diwed_divasiv.pdf
    • https://static.s123-cdn-static.com/uploads/4427295/normal_5fdfb9be6a8f6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc384fde5c7695ca9ac2351/t/5fc50b959ee0f32b87f2ea76/1606749078519/73684603665.pdf
    • https://static1.squarespace.com/static/5fcf5b7e5b099b259a78bb77/t/5fd63518b1c3f31c7a7b5a0e/1607873816184/duturapafadotu.pdf
    • https://uploads.strikinglycdn.com/files/d6695353-4be4-4bcb-9b4c-7d5b3d800182/84947391238.pdf
    • https://uploads.strikinglycdn.com/files/da861751-64c1-4073-a0db-67ae175335ab/graphing_tangent_and_cotangent.pdf
    • https://static1.squarespace.com/static/5fdc81a80526ad1a5999a26b/t/5fdcbd5152ba88654ef39d2c/1608301907329/zumudumopenabope.pdf
    • https://s3.amazonaws.com/xatojem/23875081407.pdf
    • https://static1.squarespace.com/static/5fc2a3829955c744b546b600/t/5fcc9acdc836a917f907bcd1/1607244494559/54009872504.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb96.bin
f1b72d8b5ba926d601b54ce4a6ba7410f2e878e4393a633431ad8719d8d0bfdd
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB96 5500 bytes
font_01_sfnt_off0000de5a.bin
6830a08756bfa1b210bdcbd848adff7260f7763c7e8d7851634780ac37316b6b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5A 11552 bytes