Malicious PDF — malware analysis report

Static analysis result for SHA-256 628bb6c2e2c179be…

MALICIOUS

PDF

68.0 KB Created: 2020-11-14 08:56:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 21dbe033900c49d1bad3ca473139ba3c SHA-1: dde32566ebf7a6d563847c074c8742bee5191d8a SHA-256: 628bb6c2e2c179bec09cace16561d6efbb4b24ab7643d0b9cf22e6d5f22009ba
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://trafffi.ru/123?utm_term=artificer+guide+risk+of+rain+2 PDF link annotation
    • https://xororowikaluna.weebly.com/uploads/1/3/4/6/134643421/b0771b91587fa.pdfIn PDF document text
    • https://getosadosaponup.weebly.com/uploads/1/3/4/6/134697390/misevisegijifudot.pdfIn PDF document text
    • https://pamuvomamutafa.weebly.com/uploads/1/3/4/3/134305197/pifukane_jixinozinonolo_manafofi_mepamutipup.pdfIn PDF document text
    • https://xikemusuvef.weebly.com/uploads/1/3/4/3/134322181/tuxeviz.pdfIn PDF document text
    • https://sumulejuno.weebly.com/uploads/1/3/4/3/134361372/goxonebuvorukuruviv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465556/normal_5fa7113e8d365.pdfIn PDF document text
    • https://tubumafipe.weebly.com/uploads/1/3/4/4/134458357/jijiriwil_mixugiguzifo_luwapepanovovo_boniwuxow.pdfIn PDF document text
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/vinaruzipetaso.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/tunenijexe/kenutikodi.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/21359588744.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/87589089361.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/gokobi.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/57276380486.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_off0000cdc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC0 5340 bytes
SHA-256: 59e1038f830eaa91894646347f4fdaf563ec9697b4210077bb153fedc15fc0d1
font_01_sfnt_off0000e006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE006 10264 bytes
SHA-256: f011dbc85959c9f1910bfa14e8cb914e5763ae188de9c63f8d12e49e729b5f5b

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