PDF malware analysis — malicious · 05c6ac1fa0bd528d

MALICIOUS

PDF

117.1 KB Created: 2020-06-02 05:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: bed473f4782de3b6d6ce6fea3a1b4a2b SHA-1: 4456c03d358f117232e702eba2993134d9139df1 SHA-256: 05c6ac1fa0bd528dbe1018ea3f1a00996275e8523f9e041917530b33f85f2ebf

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many of which are part of a link farm designed to appear as search results for academic content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites for further exploitation or payload delivery. No scripts were extracted, but the PDF structure and linked URLs suggest a dropper or downloader functionality.

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.
ClamAV: Pdf.Dropper.Agent-9258346-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-9258346-0
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://firstaidargyll.com/uploads/1/3/0/4/130488370/130488370.html#macroeconomics+mankiw+solutions+pdf
- http://titanacquisitions.net/uploads/1/3/0/7/130774968/7836890.pdf
- http://pilateslincoln4u.com/uploads/1/3/1/4/131407089/dutuvu-pexodo-lifefejet.pdf
- http://palatka.space/uploads/1/3/0/2/130291453/66f93851f87.pdf
- http://diegoramirezmd.com/uploads/1/3/0/6/130640020/rivosidoj-bakizowogoge-mogetefun-sajepixar.pdf
- http://firstaidargyll.com/uploads/1/3/0/4/130488370/terms.html
- http://firstaidargyll.com/uploads/1/3/0/4/130488370/dmca.html
- http://firstaidargyll.com/uploads/1/3/0/4/130488370/policy.html
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://kajunomifoj.files.wordpress.com/2020/05/rugezirol.pdf
- https://kujinanixujo.files.wordpress.com/2020/05/46365156048.pdf
- https://mepujuv.files.wordpress.com/2020/06/37916237808.pdf
- https://tupawev.files.wordpress.com/2020/05/fiburowifenajatasupa.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_off0001885d.bin` `b54d6024d0d33c6c0de5c025b2facd890ca815e9bf646124040bb02f7689b556`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1885D	12372 bytes
`font_01_sfnt_off0001b184.bin` `68d4946a734854b23cdd6ff4310fb71e8fe4d45f8b6412a75b443aad91cc0e98`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1B184	16456 bytes

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