PDF malware analysis — malicious · 64e79521a3ecfc5a

MALICIOUS

PDF

30.7 KB Created: 2020-05-15 10:32:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: ca977f061bee47a5bd26553a1e7e5c8a SHA-1: e55c8d0720d598717bde48c706447c95ca2beffe SHA-256: 64e79521a3ecfc5a9efc4298cc2891c6c7438ef80e687a98054adf0835d60e3f

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The embedded document body text, though heavily obfuscated, contains URLs that are also present in the extracted URL list, suggesting a coordinated effort to direct users to potentially harmful content. No scripts were extracted, but the sheer volume of external links points to a link farm or redirection scheme.

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://wetware.international/uploads/1/3/1/4/131452817/131452817.html#jashn+e+bahara+song++mr+jatt
- http://district1strong.com/uploads/1/3/1/0/131070847/duwifi.pdf
- http://bridesburgoc.com/uploads/1/3/0/2/130287937/384d38b760.pdf
- http://therapeuticessentails.com/uploads/1/3/0/5/130588185/woxowowilubaziger.pdf
- http://paulinefonzi.com/uploads/1/3/0/8/130814296/41c41.pdf
- http://pjscoupons.com/uploads/1/3/0/2/130287937/vapomiwuputawesove.pdf
- http://yummiesticecream.com/uploads/1/3/0/6/130620998/savefisevi.pdf
- http://americanteachersacademy.com/uploads/1/3/1/3/131398045/8006001.pdf
- http://thechicostumes.com/uploads/1/3/1/6/131637763/43c2ea2.pdf
- http://dckninternational.com/uploads/1/3/0/8/130813790/750233.pdf
- http://helloipx.com/uploads/1/3/0/8/130874146/ginenoziniru.pdf
- http://powerofyourintuition.com/uploads/1/3/0/5/130551239/44ffee833.pdf
- http://ns-synergyservices.com/uploads/1/3/0/3/130379575/wenilus_sitemubawimo_temimofif_nukodisomi.pdf
- http://connectedimpression.net/uploads/1/3/0/4/130477719/bofufesi.pdf
- http://biofouling.net/uploads/1/3/0/2/130272271/900648.pdf
- http://monkbars.com/uploads/1/3/1/4/131452886/2382667.pdf
- http://marketfb.net/uploads/1/3/0/5/130551124/nevekaba.pdf
- http://truckrepairstlouis.com/uploads/1/3/0/8/130874247/xasuxena.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- 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/
- http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00004e32.bin` `6599899b501a1ad9250661e8a981926a45ccfcd4e42d7dffc7cc723636cd1375`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4E32	9764 bytes

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