PDF malware analysis — malicious · 853ef6471020b3e9

MALICIOUS

PDF

42.7 KB Created: 2020-06-04 02:27:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: b0864562587884274dca1ebfa8545e48 SHA-1: f44a63367641fe2f4d578656456d1fad6d85f1da SHA-256: 853ef6471020b3e95d8597210a14f876c382c125d61a49a3727d4dfec15c6549

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of external links, many of which point to PDF files hosted on various domains, suggesting a link farm or SEO poisoning tactic. One prominent URL, http://74-123-73-62.mgwnet.com/uploads/1/3/0/5/130550743/130550743.html#free+picasa+3+download, indicates a lure for free software downloads. The ML classifier strongly flagged this PDF as malicious, supporting the interpretation of a malicious intent behind the link farm and download lure.

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://74-123-73-62.mgwnet.com/uploads/1/3/0/5/130550743/130550743.html#free+picasa+3+download
- http://caddiesoncourse.com/uploads/1/3/0/9/130969539/mimimuxi.pdf
- http://cestariyarn.com/uploads/1/3/0/5/130539820/8856829.pdf
- http://dns.wpea.org/uploads/1/3/0/9/130969552/236249.pdf
- http://silvanagoldemberg.com/uploads/1/3/0/3/130312972/746015.pdf
- http://beatsbytheharv.com/uploads/1/3/0/6/130639698/49294.pdf
- http://biancagentry.com/uploads/1/3/0/4/130489833/lejezun.pdf
- http://juneauquickcare.com/uploads/1/3/0/8/130874239/xepapexakenokakame.pdf
- http://74-123-73-62.mgwnet.com/uploads/1/3/0/5/130550743/terms.html
- http://74-123-73-62.mgwnet.com/uploads/1/3/0/5/130550743/dmca.html
- http://74-123-73-62.mgwnet.com/uploads/1/3/0/5/130550743/policy.html
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://repuvalo.files.wordpress.com/2020/06/fazixojorazuwuxuxi.pdf
- https://kuziwugajeko.files.wordpress.com/2020/06/gugakewi.pdf
- https://kujigeder.files.wordpress.com/2020/06/tiwobab.pdf
- https://ruxejetufe.files.wordpress.com/2020/06/buwome.pdf
- https://zemijedo.files.wordpress.com/2020/06/vozukijigaradizoro.pdf
- https://sebogoveb.files.wordpress.com/2020/06/11407355193.pdf
- https://luropatasoz.files.wordpress.com/2020/06/76711745650.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/
- http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00006e88.bin` `9923d301b3f0cb0126a5f6d208e09d9e10fe986a775dc5a91eafced989db5e27`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6E88	20504 bytes

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