Malicious PDF — malware analysis report

Static analysis result for SHA-256 b49b8d90d8002946…

MALICIOUS

PDF

70.0 KB Created: 2020-11-20 18:32:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: e94a33843863d58f9af1bcd56a6e88f2 SHA-1: b70e0ea1f987f287324441223820147f0c22769c SHA-256: b49b8d90d8002946a4da53e80b5e3c05196fd4e37d87591080bf14ce7e9bbde0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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://trafffe.ru/123?utm_term=prairie+dog+pet+legal PDF link annotation
    • https://xosetumigex.weebly.com/uploads/1/3/4/3/134371377/0eb49.pdfIn PDF document text
    • https://xetutinafo.weebly.com/uploads/1/3/0/7/130775845/suwizasunisixi-ninefebawegem-ronoguwatuki-begodubo.pdfIn PDF document text
    • https://baletepo.weebly.com/uploads/1/3/0/7/130776023/8005743.pdfIn PDF document text
    • https://rofexigu.weebly.com/uploads/1/3/0/7/130738805/ff55ecd3af.pdfIn PDF document text
    • https://togoritireso.weebly.com/uploads/1/3/4/6/134619717/mufeminumod-bibosowidiwura.pdfIn PDF document text
    • https://lefoxidegej.weebly.com/uploads/1/3/4/5/134526886/d3a09.pdfIn PDF document text
    • https://zinawadasug.weebly.com/uploads/1/3/4/3/134312837/5877370.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/zoromexemuzid/dictionnaire_acadmie_franaise_5eme_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/waxejajinigafu/manual_guillotine_shear.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/cubic_root_function.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40e811d2-0c06-4b3d-b210-f161a378a3dc/16114647520.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea15a9ab-530c-4bca-a85e-f9c2c6e054ef/mifibixawaxiposuboz.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/63732630964.pdfIn PDF document text
    • https://s3.amazonaws.com/nupotukig/76811789952.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_off0000d6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FC 4952 bytes
SHA-256: 42dcf8e3c9bfc65aa187559664d74f978c8e266f50fdf087329e4f0dbec25646
font_01_sfnt_off0000e7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E2 10548 bytes
SHA-256: a3e397c4144218c705c3c7902c6e2d01782354379e02ffa471d8a447c8d72f5f

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