Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc8dd517fd679eb4…

MALICIOUS

PDF

79.2 KB Created: 2021-02-21 23:19:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 41ce4420a7321512d2deab5b1f64e1e6 SHA-1: d16bb950d1c202809a34577c153f8b92eec417fb SHA-256: bc8dd517fd679eb403455bd5a78b37e2962fd49c229b061dfd2142ee09644bcc
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external domains, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by identifying the document as a link farm on disposable hosting, designed to redirect users to various sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/wix?keyword=castle+crashers+character+unlocks+pc PDF link annotation
    • http://astrology-personal.online/children_s_beds_for_sale_gumtreelse5h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407724/normal_60203189e8c11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492250/normal_602466d1d5332.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378618/normal_601bcb963c84c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462379/normal_5fe90ff759911.pdfIn PDF document text
    • http://daimontimur.org/kimixexibozazotuwobfma4r.pdfIn PDF document text
    • http://agent-ritual495.online/scilab_helpo7umh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471479/normal_602ed1a72d64f.pdfIn PDF document text
    • http://wowmarket.info/ponte_en_onda_scooby_doo_capitulo_1lvjxj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366668/normal_5fea276b5fe27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476416/normal_60278234c4491.pdfIn PDF document text
    • http://pomirkapa.site/kuzoganigilesujou40y9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452392/normal_5fd5f59f28dae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386349/normal_5fcc9492a21cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385410/normal_5fd0710b8c6b7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389108/normal_5fe2ee6bb0be5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490380/normal_5fe01e81f0233.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413113/normal_60006706beaa4.pdfIn PDF document text
    • http://draiwenstore.online/46344984307zhdst.pdfIn PDF document text
    • http://front-glass.website/543338075510i0ff.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_off0000faf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF2 4988 bytes
SHA-256: f980e3db1302267354a801179111aadc26ce8ed28644681df1f15d8e53602ef8
font_01_sfnt_off00010bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDE 10388 bytes
SHA-256: 92771ed4ba18b0b213ceaa5c2cae1acbb11a77642141f43e6e04471d097b80ca

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