Malicious PDF — malware analysis report

Static analysis result for SHA-256 f97353c57822f79d…

MALICIOUS

PDF

78.3 KB Created: 2021-03-23 21:11:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3803f2a1cbba2c928eb43e193a660ce1 SHA-1: e26291daca3d1ba9a7acf0ec14111cb64e3df6e2 SHA-256: f97353c57822f79d73da0f91c5b7df08326f75f5af3b738d371c0dd104a64c89
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to other PDF files, indicating a link farm designed to direct users to potentially malicious content. ClamAV detection and ML classification strongly suggest this is a phishing or malware distribution attempt. The presence of embedded URLs further supports the malicious intent.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/aws?utm_term=old+man%2527s+war+epub
    • https://static.s123-cdn-static.com/uploads/4495684/normal_5fcb1d4124bd5.pdf
    • https://static.s123-cdn-static.com/uploads/4420013/normal_600068c83a755.pdf
    • https://cdn-cms.f-static.net/uploads/4449395/normal_603419cc68bb6.pdf
    • https://cdn-cms.f-static.net/uploads/4446280/normal_5fd375b2ceb48.pdf
    • https://cdn-cms.f-static.net/uploads/4418570/normal_5fd7ea505748f.pdf
    • https://static.s123-cdn-static.com/uploads/4451971/normal_5fdfff769ede1.pdf
    • https://fefedajukuda.weebly.com/uploads/1/3/1/0/131070841/8039895.pdf
    • https://vatikaleme.weebly.com/uploads/1/3/5/3/135386674/wuxagoti.pdf
    • https://cdn-cms.f-static.net/uploads/4421477/normal_60321edeeb9ef.pdf
    • https://xugeragerowet.weebly.com/uploads/1/3/4/6/134641260/pupasoremi.pdf
    • https://rixorololexapi.weebly.com/uploads/1/3/1/8/131857390/9262891.pdf
    • https://cdn-cms.f-static.net/uploads/4531626/normal_60288288bd4fc.pdf
    • https://static.s123-cdn-static.com/uploads/4481988/normal_5ffb33bab82eb.pdf
    • https://cdn-cms.f-static.net/uploads/4499622/normal_601785e9833b0.pdf
    • https://static.s123-cdn-static.com/uploads/4393197/normal_5fcc2b3f38776.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://018ae6bf-5b6e-4bf7-bb5f-89503284f855.filesusr.com/ugd/b7931c_914ba9181e60474bb192f822ef8f7423.pdf?index=true
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_8f36872283344e6daedb4b607867ebd1.pdf?index=true
    • https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_8cef51130c0f4bb8b0cb7bdcaf5b5a67.pdf?index=true
    • https://29c5b005-6627-40e3-9da1-9f9d3dbc34dc.filesusr.com/ugd/7ad284_82294f8216b04aa0bf22a15f748e3626.pdf?index=true
    • https://8b83d164-5e56-46cc-b941-48f48810ddf3.filesusr.com/ugd/76ce43_e1f1efe177be4149a568b7a828fec352.pdf?index=true
    • 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_off0000eac2.bin
45dc87e9bfa2c98267d2c9596c8c296b96d43c1b90d39f25dfe1b1ce601834b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC2 5400 bytes
font_01_sfnt_off0000fd0c.bin
1511a07f8706701a7df61294c67ffa57210ef1c97f6f35f3a93c1b401114714c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0C 14028 bytes

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