PDF malware analysis — malicious · 141706e8ad526b6b

MALICIOUS

PDF

36.3 KB Created: 2020-06-04 14:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: ad336763eb7c36c843f503d5586db6f1 SHA-1: 583c6ba071acf067f79963fbdf0a1163dc93c229 SHA-256: 141706e8ad526b6b1db83a6a44a76feb0786606179a9ec7cda16f448c8e370ae

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on different domains. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were extracted, the sheer volume of external links suggests a malicious intent, likely related to SEO spam or directing users to potentially malicious content.

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://dustydogwoodworks.net/uploads/1/3/1/1/131164546/131164546.html#phschool+realidades+3+workbook+answe
- http://4yourmindbodyandspirit.com/uploads/1/3/0/2/130272804/3b2e69332b.pdf
- http://cpanel.onebigtreedesigns.com/uploads/1/3/0/3/130323377/vexagonebebuzidene.pdf
- http://christinamphotography.studio/uploads/1/3/1/4/131454106/fijofubikog-muvavagezopilod.pdf
- http://artgaleriemonodparis.com/uploads/1/3/0/6/130639763/rukaf-tixok-zizapa.pdf
- http://siglagroup.com/uploads/1/3/1/4/131413718/9d4842fe.pdf
- http://arafoods.net/uploads/1/3/0/7/130776185/nuparawomo-vajis.pdf
- http://dustydogwoodworks.net/uploads/1/3/1/1/131164546/terms.html
- http://dustydogwoodworks.net/uploads/1/3/1/1/131164546/dmca.html
- http://dustydogwoodworks.net/uploads/1/3/1/1/131164546/policy.html
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://gikekedigu.files.wordpress.com/2020/06/ribuwurebewavalo.pdf
- https://jedadedax605715953.files.wordpress.com/2020/06/didutami.pdf
- https://xosofivofaj.files.wordpress.com/2020/06/89714207793.pdf
- https://ribekewozepu.files.wordpress.com/2020/06/ruwukurigomivu.pdf
- https://nuvekutivuj.files.wordpress.com/2020/06/50129161879.pdf
- https://vugifokub.files.wordpress.com/2020/06/88925040749.pdf
- https://sojukitibo.files.wordpress.com/2020/06/56035642429.pdf
- https://rawujax.files.wordpress.com/2020/06/pazezogog.pdf
- https://tanudatekaj.files.wordpress.com/2020/06/zixelolo.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_off000060bb.bin` `71a74f60f42a1c8ac4d35066513fbb0eb5b207b8dde177ccd1c1b734e3bcf7b8`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x60BB	10680 bytes

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