PDF malware analysis — malicious · d296459fbb03a83e

MALICIOUS

PDF

43.4 KB Created: 2020-03-30 02:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)

MD5: 29dd9dc3ae7b86cb85de0367c05c0d86 SHA-1: 49bd0d9a4ef47a39863012a55ab9816003c39e3a SHA-256: d296459fbb03a83efb7576f3044652d57f16222d392c8df585d0f88d9e304106

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which point to PDF files with numeric or generic slugs on various domains. The document body itself contains the text 'Ejemplos de conjunciones subordinantes temporales' and includes URLs, suggesting a lure to a link farm or SEO spamming operation. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a mass external link farm.

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://www.xmo1.com/uploads/1/3/0/5/130545475/130545475.html#ejemplos+de+conjunciones+subordinantes+temporales
- http://tlcacuenergetics.com/uploads/1/3/0/3/130379959/gemimipise.pdf
- http://roucekpartners.com/uploads/1/3/0/6/130639906/gogotaveni_debunedate_pigedemege.pdf
- http://mwvhc-nh.org/uploads/1/3/1/4/131406837/0647f9de2fd5.pdf
- http://tonimagsaysay.com/uploads/1/3/0/7/130776817/4223815.pdf
- http://hbcommunitymortgage.com/uploads/1/3/0/5/130589264/boluwegolupo.pdf
- http://suburbanwoodsman.com/uploads/1/3/1/0/131070149/875e45126a9d9.pdf
- http://michaelamacpherson.com/uploads/1/3/1/4/131453565/jojemu.pdf
- http://maltaescapes.com/uploads/1/3/0/9/130969435/8838206.pdf
- http://novamedia.dk/uploads/1/3/1/3/131380729/31375.pdf
- http://mcsightco.com/uploads/1/3/0/4/130477007/sovutevesodu.pdf
- http://com-unlocked-valid-account.com/uploads/1/3/1/3/131398455/dasemonas.pdf
- http://joyceknock.com/uploads/1/3/0/5/130589244/mevikep.pdf
- http://carlandrewsandassociates.com/uploads/1/3/0/9/130969923/8fdf21c3ba2.pdf
- http://jamesferris.ca/uploads/1/3/0/4/130483050/d25aea.pdf
- http://ashleynboyd.com/uploads/1/3/0/7/130738708/wuxij_widej_jizagewaret.pdf
- http://simplymagicaljewelry.com/uploads/1/3/0/6/130621890/povidetez_lukupakefev.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00007443.bin` `dfd1ffddb5ee0458bbabab4b13a44a125b7b882764b0c257271a699f1fddbb3b`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7443	8844 bytes
`font_01_sfnt_off00009450.bin` `e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9450	2652 bytes

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