Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e1fdd715b28b9b…

MALICIOUS

PDF

65.7 KB Created: 2021-02-25 22:04:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a485b4b03fb1ce99d51a909af9c13db6 SHA-1: b676545df1a2c0aa98dbcef7fb173b4cb71f955b SHA-256: c3e1fdd715b28b9b78c74f261544f9af2cc071467059a51f3d0683ae78a6947e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous external links, suggesting it's part of an SEO link farm or a phishing campaign designed to redirect users to malicious sites. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://jottigo.ru/award?keyword=rock+pocket+mouse+activity+answer+key PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4389599/normal_5fe29c17d45cf.pdfIn PDF document text
    • https://xisilejawot.weebly.com/uploads/1/3/4/0/134016881/kilenunabiguta_gumodoj_sodepojudubabe_zexoki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444110/normal_5fc846b34f389.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443329/normal_600871a827a48.pdfIn PDF document text
    • http://infonewstravel.com/66942475207cu649.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423428/normal_601e4a9d8a4bf.pdfIn PDF document text
    • http://discount50it.pro/474456941165ek0i.pdfIn PDF document text
    • http://circleshtang.xyz/how_to_draw_a_cartoon_dogg4k1y.pdfIn PDF document text
    • http://kukushpa.fun/fugogosudesosavutalepygz3v.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421048/normal_5ff26ad4d74b5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457298/normal_5ff60b628fff5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380695/normal_600c46e3690e8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/hearts_of_iron_4_guide_world_conquest.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/47010297788.pdfIn 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_off0000c717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC717 5372 bytes
SHA-256: 1fccdb16d5d93b57b236b214ff453b9c2d7502d4ce0c2f027ebec026904371c8
font_01_sfnt_off0000d96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96B 9500 bytes
SHA-256: ecca15cafd3e56f75c3e72a4471be835540ddda427fa1d7de494de0e76c10fd4

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