Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f7beb6917f4a91…

MALICIOUS

PDF

79.2 KB Created: 2021-03-28 12:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9328a34ec3c6856c3e6be1837783c576 SHA-1: 82123ba6388417adbb93c43250c8cbb4801559ff SHA-256: 82f7beb6917f4a915b06e5f20954c458126d0abe8f28a92d2874c74df1152162
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://seumenha.ru/123?utm_term=flight+simulator+x++size PDF link annotation
    • https://cdn.sqhk.co/wimakebibane/eificia/pefubo.pdfIn PDF document text
    • https://cdn.sqhk.co/bisuligiga/VlOhdgh/79688532237.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424692/normal_5fe898f1cdd81.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/jcrghJ1/goxowox.pdfIn PDF document text
    • https://cdn.sqhk.co/mawejoxejobe/age2cic/43984628587.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467017/normal_6010a7007ccb1.pdfIn PDF document text
    • https://cdn.sqhk.co/fotusonetagu/ahdE7he/25374691883.pdfIn PDF document text
    • https://cdn.sqhk.co/popenewosaso/3ighgjj/80415283312.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://latevafizatum.rf.gd/car_aircon_troubleshooting_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9c21387-ec09-4c01-91a5-38c993ef5340/bolens_lawn_mower_parts_diagram.pdfIn PDF document text
    • http://pazixurofuni.epizy.com/araba_paralar_ve_grevleri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4501f33-0c9d-4cd5-a096-3b05de5eccd1/wopodokofonijadi.pdfIn PDF document text
    • http://situxunekidini.epizy.com/visio_org_chart_templates.pdfIn PDF document text
    • https://b133b025-67d1-4190-9e53-fbb99503dec2.filesusr.com/ugd/caf13f_c600517aa6af4985a29cc88a6fe4ea52.pdf?index=trueIn PDF document text
    • https://21d44941-995c-48b9-956b-8145330e20d5.filesusr.com/ugd/577b75_80566ba7e2c44db6beaa60483dcd2a43.pdf?index=trueIn PDF document text
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_ff7905f60f3f4b59bd6aa7cdf93c00b6.pdf?index=trueIn PDF document text
    • https://aa5f33e9-793b-4807-a257-9eac84d314d0.filesusr.com/ugd/aa57b2_6a0a976db3f142e6bbadd10f39b19033.pdf?index=trueIn PDF document text
    • https://de99c131-68bf-4271-bcef-cda292486844.filesusr.com/ugd/f5892c_140d3a2af9b045fdbd484ba0775192cc.pdf?index=trueIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0F 5172 bytes
SHA-256: b79ae378d97945a1393b2959d799d39c62acec25704f164326ef40ff989bf6a8
font_01_sfnt_off00010b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B85 10964 bytes
SHA-256: db536b7664a0e6577c3170668ca55f481383390755d87b68c0f2af6e20bd58d2

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