Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b6ded4cbf1180b4…

MALICIOUS

PDF

75.8 KB Created: 2021-03-01 04:38:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 952df2752b3b822faadafdb082649cb1 SHA-1: 34c0123f3ce40619b1bd1555ad3cab34f25b061f SHA-256: 5b6ded4cbf1180b4c1e54fafe90805ea1c96b27e419b956e9e09472908917657
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified as a link farm, with many hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or SEO spam. The presence of numerous external URIs and the link farm heuristic point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://resalured.ru/wix?keyword=titan+quest+parents+guide PDF link annotation
    • https://cdn.sqhk.co/viwiratoposu/N1iiidl/migepu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486552/normal_5fd7adae7ffb2.pdfIn PDF document text
    • http://rollernefritmassage.xyz/motorola_apx_6000_vs_7000dvzvf.pdfIn PDF document text
    • http://world-wild-shop.com/trafego_pago_instagram_o_querpvma.pdfIn PDF document text
    • http://helplnstagramcontact6088756.com/a_n_r_songs_freegbpsa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467927/normal_5fd32f45669af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369163/normal_5feca0405e40b.pdfIn PDF document text
    • http://gonugotez.22web.org/38966814988.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407807/normal_600e3087bee36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377098/normal_6033a6be8caf1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493876/normal_5fefb523d8d67.pdfIn PDF document text
    • https://zarekekokubudal.weebly.com/uploads/1/3/1/3/131398532/savifepuxi_mexekasatof_femisib_sunifalut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481162/normal_5fe15b3f30b4f.pdfIn PDF document text
    • https://jurivulanikep.weebly.com/uploads/1/3/4/5/134525456/5b4e09.pdfIn PDF document text
    • http://wumijodurixemi.22web.org/devofapaxus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483335/normal_5feda670484bf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://silapopo.epizy.com/ethiopian_flight_crash_report.pdfIn PDF document text
    • http://zibozepor.rf.gd/64858223981.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_off0000ebfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFE 5168 bytes
SHA-256: c85b9d25b3856c66fc35f36c022959d0d269ebb951224ac024427eb5302d57fe
font_01_sfnt_off0000fd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9D 10600 bytes
SHA-256: ad6a0d4a622a87c80f77b01cd44c874c5b5aa2bf362a9851fcdb705e44ae4884

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