Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e8fac75df0da43c…

MALICIOUS

PDF

48.6 KB Created: 2020-03-27 08:59:55 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cab51808f81a715fe40f2681471c994d SHA-1: 41959c9a1854860dda9232a56d174d209567abfc SHA-256: 8e8fac75df0da43cac43b72718e71aa8f42a0c38d3d60d5cdb175d51e792da56
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicating a link farm or SEO spam campaign. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of numerous URLs suggests the document's primary purpose is to redirect users to potentially harmful websites.

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://inspiredbymonet.com/uploads/1/3/0/6/130620882/130620882.html#tejido+muscular+cardiaco+ubicacion
    • http://admin.cutfootsiouxresort.com/uploads/1/3/0/8/130874600/ponuto-fisosodod-fomonidil-nuvafuz.pdf
    • http://myberrygoodlife.com/uploads/1/3/0/6/130604283/5348326.pdf
    • http://www.chicshak.co.uk/uploads/1/3/0/6/130640101/fufon.pdf
    • http://www.liz-donnelly.co/uploads/1/3/0/6/130603745/1801498.pdf
    • http://kidswego.com/uploads/1/3/0/4/130483249/ridetev-sinuwifebufuju-gekij.pdf
    • http://newchoicemusic.com/uploads/1/3/0/5/130551057/c5138c86f.pdf
    • http://worldorderent.com/uploads/1/3/0/7/130738658/kurikixafemi.pdf
    • http://championchefscookingschool.com/uploads/1/3/0/2/130271207/c1ab663e0073.pdf
    • http://mylibruldad.com/uploads/1/3/0/5/130589214/woxixesuk-rabamodexenebo-furusodaboxewup-wadebi.pdf
    • http://warehousesixmusic.com/uploads/1/3/0/6/130605072/6442847.pdf
    • http://hostmaster.thesharpening.co.uk/uploads/1/3/0/5/130589305/sezofo.pdf
    • http://middleschooltechtalk.com/uploads/1/3/0/5/130546971/majepagokux.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_off00007641.bin
a65a42f1ba63911c65e0ed8345d20c31b79dc65a2829d86131f3a0fe1f01f1b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7641 8320 bytes
font_01_sfnt_off000094a1.bin
e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94A1 2652 bytes
font_02_sfnt_off00009e08.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E08 16036 bytes

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