Malicious PDF — malware analysis report

Static analysis result for SHA-256 f290c3112d55eecb…

MALICIOUS

PDF

68.7 KB Created: 2021-01-27 19:07:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 54a33356b33840ba6bbd80958cd623fd SHA-1: 751d7c63080f8d3347352ef5bb4eff5796bfc106 SHA-256: f290c3112d55eecb8ea449b53c5a06e07baddc4a9c3e98d3f26a7f0bcbec9aaf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a high number of external links, indicative of a link farm or a lure to download additional content, as flagged by the PDF_SEO_LINK_FARM heuristic. The presence of a 'download button' lure and ClamAV detection as Pdf.Phishing.Trojan further supports a malicious intent. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the structure and heuristics suggest it's designed to facilitate the download of a second-stage payload, likely through embedded JavaScript or by directing the user to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bologen.ru/aws?utm_term=soal+cfit+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4484612/normal_5ff199ade8011.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383806/normal_6006a69f5418d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488346/normal_5ffb899b0fab9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469631/normal_5fe992b5b059f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479675/normal_5ff9a5c4d3408.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490516/normal_5fd36f12b4e46.pdfIn PDF document text
    • http://amsidisi.xyz/elliptical_trammel_project_report23dhz.pdfIn PDF document text
    • http://fishland.store/the_burger_shop_wake_forest_menuulf5o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369779/normal_5ff590fcaeaa5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389080/normal_5fdab31f4fca5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368227/normal_5fdc35ff26a09.pdfIn PDF document text
    • https://tasiwusod.weebly.com/uploads/1/3/5/3/135351817/jusopipob.pdfIn PDF document text
    • http://jakor.pro/idioms_worksheet_high_schooleblum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464065/normal_5fd79a29d4600.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403429/normal_5fc8c35707d3d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000d123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD123 4980 bytes
SHA-256: 11a85e2e04debdec34b1293b48df00de5a1231b0883bbbd446399e2c86612004
font_01_sfnt_off0000e22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22A 10532 bytes
SHA-256: 772dfcc355f39a7bfe29cdd908843987ca489ed9e8a7cbec6f4c93122f6a886d

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