Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c54138b272861dc…

MALICIOUS

PDF

41.4 KB Created: 2020-04-05 09:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 26ca4ca448c03539c11a7bf01340164d SHA-1: 761639f433d0809e5ea44b0fe59ee2889e02478e SHA-256: 8c54138b272861dced02b6828784077976b4216721e53d7943bdad05fc08dbbd
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on different domains. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains some of these URLs, suggesting a deliberate attempt to redirect the user to a network of potentially malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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.
  • 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 http://jamiefehr.com/uploads/1/3/0/2/130272396/130272396.html#para+que+sirve+el+tallo+del+arbol
    • http://crewhousefortlauderdale.com/uploads/1/3/1/0/131071166/vijipomenojero-pipes-baxonif.pdf
    • http://everythinglaurajo.com/uploads/1/3/0/4/130483275/febf3d365e27.pdf
    • http://theherbalandnutritionalexperience.com/uploads/1/3/0/5/130539479/eb5912f.pdf
    • http://felicialart.com/uploads/1/3/0/3/130313157/39c920ef.pdf
    • http://1210photography.com/uploads/1/3/0/5/130539111/7736066.pdf
    • http://raquelames.com/uploads/1/3/0/5/130539185/9223c4e4c0a.pdf
    • http://samaiyahsart.com/uploads/1/3/0/5/130589128/faxajojorawezup-loxudoxugor-xuregakumob-difujesor.pdf
    • http://bellasbling75.com/uploads/1/3/0/6/130621687/kiterijamo_ginijanu_xegatufosime_zotex.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000753f.bin
b261a71f7d34ba7679ce9411dfe1e89066df9fc1411b00912aa22cab6b8c416a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x753F 9484 bytes

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