Malicious PDF — malware analysis report

Static analysis result for SHA-256 63304fc8e0cf48e8…

MALICIOUS

PDF

77.9 KB Created: 2021-04-20 04:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: bb5a8ca169f5d4cc1789b530c203be0a SHA-1: 77f7aacf16c41cc57e01b6148f03941ff49c6898 SHA-256: 63304fc8e0cf48e872595ddffaad5ea82af222aa4306d4d71a5aefaab8216ba7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('druttle.ru') that is flagged as unknown. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links to disposable hosting, suggesting a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://druttle.ru/strik?utm_term=what+is+meant+by+theories+of+multiple+intelligences PDF link annotation
    • https://pinozawekik.weebly.com/uploads/1/3/4/5/134589254/82e83b10fec613.pdfIn PDF document text
    • https://zepusarogetiki.weebly.com/uploads/1/3/4/6/134687077/lujalemetopi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493266/normal_5fcd8925b374a.pdfIn PDF document text
    • https://taxurazuzar.weebly.com/uploads/1/3/4/0/134042721/992b42e3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387224/normal_60606b2a049a3.pdfIn PDF document text
    • https://nesamakamaxo.weebly.com/uploads/1/3/1/6/131636712/8846486.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386837/normal_5ff09678c0f53.pdfIn PDF document text
    • https://vezutokabev.weebly.com/uploads/1/3/4/7/134758566/niserebamobexex.pdfIn PDF document text
    • http://xofitazuregokud.mywebcommunity.org/makalah_tentang_bahaya_merokok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421476/normal_5ff3fbd2b44f6.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/pibajuwi/charlemagne_unites_germanic_kingdoms_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/rufef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c17a5514-d2f3-4042-893f-05ff4d316594/doubt_john_patrick_shanley_full_text.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98f44cbe-cd49-40a8-b644-92a57a254491/fuxapojazisivokali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7302348-ffe3-4a05-8da4-8c46174e5dbc/sw_unit_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0534a33-6b16-4a72-83f6-353ad049583c/is_ssr_good_for_stocks.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/xovopolegifiwoxoxama.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb45a2ea-3a2d-404d-9156-71e427bfa1c6/putimitanedixuxogawalipen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e21bf117-9051-4b06-81cd-9a4b9c5f03d8/22243161995.pdfIn PDF document text
    • http://bujekotu.atwebpages.com/sindrome_anemico_definicion.pdfIn PDF document text
    • https://doi.org/In 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_off0000f138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF138 5684 bytes
SHA-256: 17dcc92bd0257be0028551a91a189d14c4ba3b2ce85095b2ab198dcdf0473829
font_01_sfnt_off00010478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10478 10928 bytes
SHA-256: a787041940b1ab8b19fdc02fb0e0177b80007f4b317f6d5fc9ed96cadcdd611c

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