Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0ea3c7f7fb8c1e3…

MALICIOUS

PDF

42.2 KB Created: 2020-03-16 14:42:10 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: de73d900d91b73ac5b35dde6e9e8b6c9 SHA-1: 2b94f9910301bbfd0000ec97c772e10ba68a00e6 SHA-256: a0ea3c7f7fb8c1e30b9a649ac3885ed6ed833745ad0bd6e36c3a045521e66c8a
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, a technique often used for SEO poisoning or distributing malware. The ML classifier strongly indicated maliciousness. The embedded URLs point to various domains, suggesting a link farm designed to redirect users to potentially harmful content. No scripts were extracted, but the PDF structure and URL distribution are highly suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://aiboyule.br3h.com/uploads/1/3/0/3/130379096/130379096.html#%28version+6.00%29+-+itn+chapter+8+exam
    • http://www.thehotel-show.com/uploads/1/3/0/3/130324420/1fa652b.pdf
    • http://www.thecatholiccandlecompany.com/uploads/1/3/0/4/130478868/323cc620e.pdf
    • http://mta-sts.thekingfisher.co.za/uploads/1/3/0/2/130288751/3770981.pdf
    • http://griffelse.com/uploads/1/3/0/6/130604799/duwivorapetag.pdf
    • http://arktaym.com/uploads/1/3/0/5/130545185/6f8b3a3123bc.pdf
    • http://kitchitup.com/uploads/1/3/0/5/130539101/238760.pdf
    • http://www.sl-ces.co.uk/uploads/1/3/0/8/130813953/25e5489c9c5db.pdf
    • http://mail.theedgecenter.net/uploads/1/3/0/8/130874224/vebaxatupevurukiwu.pdf
    • http://quickdrink.org/uploads/1/3/0/8/130814675/536d4a66180c7.pdf
    • http://www.hookerhomebuyers.com/uploads/1/3/0/5/130551001/5e8f54293.pdf
    • http://rgoreymedia.com/uploads/1/3/0/4/130476168/newixavefabipi_wesatuvurar_lufigo.pdf
    • http://beliteglobal.com/uploads/1/3/0/5/130551551/sajaxosedarodub.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_off00007d01.bin
1eb02ddae49cf316004ebd587fa69ccc4c4fc5361c19daa63afcc8707d67505b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D01 8032 bytes

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