PDF malware analysis — malicious · 8f85735897ca9ae8

MALICIOUS

PDF

66.6 KB Created: 2020-11-21 04:22:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 0116a34256b8bba1a898dfcf3af5196d SHA-1: d6bbbaa2537e09e4eb7a8976b226f256b31df95f SHA-256: 8f85735897ca9ae8bbce9a1299985ab1455f8f253bd8fdda82ce6fbd69b2adf3

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, with one pointing to a potentially malicious domain. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score suggest malicious intent, likely to lead users to harmful content or phishing pages.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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 https://trafffi.ru/123?utm_term=ww1+british+uniform+diagram
- https://gaxirakim.weebly.com/uploads/1/3/4/6/134605205/3634893.pdf
- https://cdn-cms.f-static.net/uploads/4367275/normal_5f889d9f73d39.pdf
- https://cdn-cms.f-static.net/uploads/4444852/normal_5faa7ff58a6ab.pdf
- https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/temuremim-jitit.pdf
- https://titumakusijuvap.weebly.com/uploads/1/3/4/3/134353199/jitesugasa-ravutogebatazep-bulejob.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://uploads.strikinglycdn.com/files/96c1d1e0-60ff-41d2-8a23-5709229423c8/star_wars_leia_porn.pdf
- https://s3.amazonaws.com/fulazelof/arithmetic_and_algebra_again.pdf
- https://s3.amazonaws.com/wanasuvedigo/4486502933.pdf
- https://s3.amazonaws.com/wovitiku/natofegutewevivagirunipuv.pdf
- https://s3.amazonaws.com/digigitusuduk/advanced_engineering_mathematics_6th.pdf
- https://s3.amazonaws.com/sepawi/bach_fugue_in_c_minor.pdf
- https://s3.amazonaws.com/lusegokaves/excel_bedingte_formatierung_formel_oder_wert.pdf
- https://s3.amazonaws.com/wivunonovef/vedunurolalilox.pdf
- https://s3.amazonaws.com/gewuwasi/silujakisisupeda.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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000cadb.bin` `8c44f9e4e07b6696f452c944791604e50bd5580111a39c30b0875ec80f707371`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCADB	5584 bytes
`font_01_sfnt_off0000ddcd.bin` `491d44997d6697d96dd4376bdb886aeb76a3dc57d60706ca4bb5a665b584ca5c`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDDCD	9436 bytes

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