Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbf29584c7147e62…

MALICIOUS

PDF

78.1 KB Created: 2021-03-01 17:41:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 7df6a0d3993db49abeeabf8567870218 SHA-1: f0b89817703213b27885e2b4bb0da3b79b9bc07f SHA-256: bbf29584c7147e62a0ef36937ab508b3382571e5b11780dead0db5ba1f878369
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The embedded links, such as 'https://gimoguvi.ru/strik?utm_term=java+8+lambda+expression+tutorial+pdf', are disguised as a tutorial to entice clicks. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/strik?utm_term=java+8+lambda+expression+tutorial+pdf PDF link annotation
    • https://raxeruzuk.weebly.com/uploads/1/3/4/7/134743740/lalajubejadu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472501/normal_5fcf88fe9bb48.pdfIn PDF document text
    • http://dimozakebaba.scienceontheweb.net/pride_and_prejudice_movie_online_subtitrat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415936/normal_60378d7744f09.pdfIn PDF document text
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/bubifili.pdfIn PDF document text
    • https://zazukorowoko.weebly.com/uploads/1/3/4/4/134488568/povopifagikakile.pdfIn PDF document text
    • http://popenufavox.iblogger.org/sotobofu.pdfIn PDF document text
    • https://gijesilikisuzid.weebly.com/uploads/1/3/2/6/132683000/japuzogog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367625/normal_6037c67181aad.pdfIn PDF document text
    • https://rudozusaviso.weebly.com/uploads/1/3/4/0/134041113/8813308.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426682/normal_6026d64907233.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nejarisiwudu.atwebpages.com/19503369021.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/product_inventory_management_excel_template.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_off0000f409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF409 5640 bytes
SHA-256: 9c9c9d7c87a18e99b339777ee1bd373c0289183f7e6d557400b6313a0ae7e412
font_01_sfnt_off0001072c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072C 10616 bytes
SHA-256: aa21b1928da512814492d9c749c1561a821ace08f11f9bc465c00b75cbf5d076

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