Malicious PDF — malware analysis report

Static analysis result for SHA-256 7171cc7d8f702e96…

MALICIOUS

PDF

42.6 KB Created: 2020-04-20 02:15:30 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 542660ea7280ec1abed025d03ea7b672 SHA-1: 94d27dfc0ed9b8495a9e4134184c34e9180cb573 SHA-256: 7171cc7d8f702e96cfe3e6f0b480ef9ee646b71e5ff6fed3f60a81c1b18d4684
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or content distribution scheme. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine the exact user-facing lure. The ML classifier strongly indicated maliciousness.

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://gomriz.com/uploads/1/3/1/4/131412558/131412558.html#caries+dental+definicion+pdf PDF link annotation
    • http://spartanninja.com/uploads/1/3/1/4/131407353/tadijibunogapevef.pdfIn PDF document text
    • http://happihaha.com/uploads/1/3/0/5/130590334/sazaw.pdfIn PDF document text
    • http://chelmer.org/uploads/1/3/0/5/130550910/cf375e8e.pdfIn PDF document text
    • http://bb-game.net/uploads/1/3/1/1/131164076/vufad-polipirid-mererorax-jugazire.pdfIn PDF document text
    • http://caesarjewels.nl/uploads/1/3/0/7/130775284/6c1fa.pdfIn PDF document text
    • http://linksvirtualgolf.com/uploads/1/3/0/5/130551536/3432483.pdfIn PDF document text
    • http://verticalintegration.com/uploads/1/3/0/7/130775904/2644886.pdfIn PDF document text
    • http://katherinewolff.net/uploads/1/3/0/9/130969798/rigatu.pdfIn PDF document text
    • http://chronicedibles.net/uploads/1/3/0/2/130272504/4133638.pdfIn PDF document text
    • http://restored2purposepublishing.com/uploads/1/3/0/6/130639775/kirobedujopemas-wulevaxi.pdfIn PDF document text
    • http://mimlondon.com/uploads/1/3/1/4/131453858/3971581.pdfIn PDF document text
    • http://easycurtains.net/uploads/1/3/0/4/130476597/rusowerotuzapuw_jefulowu_duxidozub.pdfIn PDF document text
    • http://justblessedphotography.com/uploads/1/3/0/7/130776805/9752976.pdfIn PDF document text
    • http://jminternationalenterprises.com/uploads/1/3/1/3/131384797/letuf_wolubuzewun_rujufukigufovi.pdfIn PDF document text
    • https://www.org/en/tooth-abscess-information/In 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007e64.bin
f46337106e63a136ca9f5445b7cb1d8482f2f9e05cd16a67d31cd19bbbf22b53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E64 8756 bytes

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