PDF malware analysis — malicious · 6773fc0eab49a6bc

MALICIOUS

PDF

41.2 KB Created: 2020-06-11 19:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: b9827acfa642bdddfb3bcfb4579da6b9 SHA-1: fc1890c462e93cf38634fbf208a40f02a3eed47c SHA-256: 6773fc0eab49a6bcd107d498c67102c613088c8f6b928a00f58d7f8523f2a5ef

104 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links to other PDF documents, presented as 'solved papers' to entice downloads. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a link farm or SEO abuse tactic. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the document's structure and embedded URLs point towards a phishing or malicious content distribution scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 5

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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://ggaragefab.com/uploads/1/3/0/6/130621873/130621873.html#mat+solved+papers+download+pdf
- http://interactivemeditation.com/uploads/1/3/1/3/131384255/2851810.pdf
- http://openmindsoutreach.org/uploads/1/3/0/4/130436125/b1ac7e86f.pdf
- http://emmittselite.com/uploads/1/3/0/6/130640136/xumoworame.pdf
- http://vistasinfinitas.com/uploads/1/3/0/7/130740508/gobexilebuj.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://nediwob476369769.files.wordpress.com/2020/06/junez.pdf
- https://nabisawo.files.wordpress.com/2020/06/wawogawu.pdf
- https://xininew948096142.files.wordpress.com/2020/06/bikenajimuwajam.pdf
- https://jedunev.files.wordpress.com/2020/06/77849325547.pdf
- https://xuzorun.files.wordpress.com/2020/06/lakaketasigelawe.pdf
- https://kakimuk.files.wordpress.com/2020/06/dikejuberitobatovefumu.pdf
- https://potiniwuvo.files.wordpress.com/2020/06/20172337816.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
- http://dejavu.sourceforge.net
- http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00005fb9.bin` `1a56cfd63c4be69a292c834fa2833e7aa8df98e71b75d205f1bae4cd8f76e01f`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5FB9	10764 bytes
`font_01_sfnt_off0000849a.bin` `c9557d91917e40dbb2ce09b7ef560a04a9a832ffe2ebcac6b50408a58351272e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x849A	16092 bytes

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