PDF malware analysis — malicious · 98d9871fa826ef16

MALICIOUS

PDF

44.4 KB Created: 2020-04-18 13:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)

MD5: d708bb91f8de45b6c12d3e9d5feefb02 SHA-1: 3eb0312b6948bba3b6ccc25c31d66d9904ac82b2 SHA-256: 98d9871fa826ef16bef19b18dc00b5ff3e665b960eb2507be1968d876ed58469

94 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains numerous external links, many of which are structured in a way that suggests a link farm for SEO manipulation or malware distribution. The document body, though heavily obfuscated, contains a URL that appears to be a lure for installing an XML formatter, likely a pretext to redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a large number of external links.

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://cjentzart.com/uploads/1/3/1/4/131453658/131453658.html#install+xml+formatter+visual+studio+code
- http://pandpproductsales.com/uploads/1/3/0/6/130639223/jotunafa.pdf
- http://liukangscloset.com/uploads/1/3/1/4/131407082/ferobir.pdf
- http://deinehandwerker.ch/uploads/1/3/0/8/130874680/6994393.pdf
- http://www.genesisofrevelation.com/uploads/1/3/1/3/131383848/7819584.pdf
- http://carpenterandthelady.com/uploads/1/3/0/2/130289515/vukel_xelanot_bamibugu.pdf
- http://vitiligo.store/uploads/1/3/0/7/130776041/3902908.pdf
- http://fabricatorsfinancing.com/uploads/1/3/0/7/130776779/nobabizisuge.pdf
- http://salesuniform.com/uploads/1/3/1/6/131637302/sagakivotiduzanadef.pdf
- http://coisinhadopaiatelier.com/uploads/1/3/1/4/131483229/wejiraz-topaxulax-figorajama.pdf
- http://medowieservicecentre.com/uploads/1/3/0/5/130539059/6827439.pdf
- http://hickorysweetbbq.com/uploads/1/3/0/6/130620803/bfafed.pdf
- http://wholelivingfarm.com/uploads/1/3/0/2/130271041/b68d9d.pdf
- http://vitiligo.store/uploads/1
- 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000655d.bin` `9fc11e5586259658e52508c3d76a3e45f71ebee170f1d220cb32379bd0315ab5`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x655D	8272 bytes
`font_01_sfnt_off0000857a.bin` `e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x857A	2652 bytes
`font_02_sfnt_off00008ee3.bin` `5b811c05dc58fd4317e48b58dff860d8622f443127ba17c264535f088c40e66c`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8EE3	16576 bytes

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