Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c476e2df79b2d03…

MALICIOUS

PDF

52.1 KB Created: 2020-03-17 09:44:55 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d9b34362985913b2398f46d7681fc26d SHA-1: c983bba1af7415777f09eb98bb7eb5f2e29461ca SHA-256: 7c476e2df79b2d034237fb1ba7be88d9b6bc4283d033098fe953e6200c3c7152
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links pointing to various domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern observed is the distribution of numerous links, likely intended to direct users to potentially harmful content or for SEO manipulation purposes. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of specific user lures.

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://minnesotahydrographics.com/uploads/1/3/0/6/130604166/130604166.html#que+es+la+honestidad+academica+wikipedia
    • http://troybuyshousesindiana.com/uploads/1/3/0/8/130814976/4983989.pdf
    • http://mayrapinedanotary.com/uploads/1/3/0/8/130874163/7423492.pdf
    • http://thenxtblog.com/uploads/1/3/0/3/130313398/riseset.pdf
    • http://sitemove557.com/uploads/1/3/0/6/130621613/vipuzogorexukejix.pdf
    • http://www.attleborodemocrats.org/uploads/1/3/1/1/131164364/974898.pdf
    • http://www.equine-everything.com/uploads/1/3/0/5/130539825/refawibexesite-jaxepugowibalal-pepigid.pdf
    • http://iamdegoat.com/uploads/1/3/0/3/130323390/d8827a920.pdf
    • http://budyzook.com/uploads/1/3/0/6/130621808/suragojat-pizezebedivaj-febaki-xifasizumi.pdf
    • http://noapparentreason.net/uploads/1/3/0/3/130313024/xuvopug.pdf
    • http://timelesstreasures-us.com/uploads/1/3/0/3/130323517/2979a0ee2c.pdf
    • http://phorion.com/uploads/1/3/0/6/130604342/5347226.pdf
    • http://3828riverroadbricknj.com/uploads/1/3/0/5/130588434/6889532.pdf
    • http://eventfullondon.com/uploads/1/3/0/2/130270738/zosivisivobuzavabi.pdf
    • http://sabertruthtiger.com/uploads/1/3/1/0/131071159/75d91ea.pdf
    • http://maralynhargrove.com/uploads/1/3/0/4/130435667/vijemazezimojer.pdf
    • http://74-123-73-185.mgwnet.com/uploads/1/3/0/6/130620858/xufuz.pdf
    • http://mail.eraconsultants.com/uploads/1/3/0/6/130639840/nifus.pdf
    • http://govfilingsonline.net/uploads/1/3/0/4/130436343/zutaxorofetojifu.pdf
    • http://pedenportfolio.com/uploads/1/3/0/4/130436197/ab14cc9e.pdf
    • http://fsucapitalgroup.com/uploads/1/3/0/5/130539642/memexefisomokej-vefiveviriram-roxilodi-savifokilalu.pdf
    • http://apexmspta.org/uploads/1/3/0/2/130289765/wuwut.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000081af.bin
78451fa7af393ed9ab232250725da033d655492fcfba547498c64fb1a029cd2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81AF 9012 bytes
font_01_sfnt_off0000a226.bin
e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA226 2652 bytes
font_02_sfnt_off0000ab8d.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB8D 16036 bytes

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