Malicious PDF — malware analysis report

Static analysis result for SHA-256 15bcb4cc6c96019b…

MALICIOUS

PDF

152.8 KB Created: 2021-05-31 12:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: b53cd300a1e78f65687a141fec92c584 SHA-1: e5e21416add22dc120edc1c5cbb52b50d2d2a4e6 SHA-256: 15bcb4cc6c96019b74fb4ee371c408f7f4a7a6057156e3c9b90d0aafb0bdadc6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, with a high-risk heuristic indicating it's a link farm on disposable hosting. The primary malicious URL, https://botokaw.ru/123?utm_term=fuseform+brigandine+3l+jacket, is likely the intended destination for the user, suggesting a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/123?utm_term=fuseform+brigandine+3l+jacket PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4411922/normal_6009f5ee8f3d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375352/normal_5fd6fd2fc0a55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413570/normal_600c71f7405d6.pdfIn PDF document text
    • https://virobejiku.weebly.com/uploads/1/3/5/3/135324848/nugudixuritaz.pdfIn PDF document text
    • https://funifagokose.weebly.com/uploads/1/3/2/6/132681236/0c5992d.pdfIn PDF document text
    • https://bosuzegenelulu.weebly.com/uploads/1/3/4/1/134131522/f5aa25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456393/normal_60690fbaf29d4.pdfIn PDF document text
    • https://duxoberadu.weebly.com/uploads/1/3/4/7/134718286/kofavejim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419828/normal_5fd7a7e9419b0.pdfIn PDF document text
    • https://lewuroluloxujul.weebly.com/uploads/1/3/4/6/134678017/xigipewasofireb.pdfIn PDF document text
    • https://lovokavupas.weebly.com/uploads/1/3/0/7/130776776/72fb80f8ce031d.pdfIn PDF document text
    • https://rujogapojepon.weebly.com/uploads/1/3/4/5/134597846/8525931.pdfIn PDF document text
    • https://gusilurilusod.weebly.com/uploads/1/3/4/4/134480619/6124680.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483602/normal_5fdfb796001a3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/71a70193-cc07-4f94-b239-6d3e1468cd47/medifavufe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18a9c523-b241-47e3-b521-d8b82cb1b9b4/everyday_snacks_that_are_gluten_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec33cb43-b7e9-4d74-962b-23088bc6c621/how_to_treat_ammonia_in_water.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e88a8dc-e809-47e3-b54e-0dde6b3ac6ed/pamekafomiwikokawisawo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF808 96796 bytes
SHA-256: b52659a42d75501e6344dd3435c4d559708e29571bbc5d67875119f5500aaa0f
font_01_sfnt_off0002170e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2170E 5740 bytes
SHA-256: 47c6c6722224d86980efd4349ea72edb1e00edea527723c9cfe9ecbbf9f0e65e
font_02_sfnt_off00022a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22A8C 12316 bytes
SHA-256: 995f61ef8cf6de5c82700d714f5f3d15795451e72a4d434eb038303db0248d9b

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