PDF malware analysis — malicious · 28069291db33646d

MALICIOUS

PDF

93.4 KB Created: 2020-04-09 10:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)

MD5: 07fb355417ea8693e984ec2e29a850eb SHA-1: aa300f44f97314ec944081ee2e38025cea2006d0 SHA-256: 28069291db33646d0af0f82d618a4e9654dbeaa94c40293f7199ce62bb6e8b12

94 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many pointing to PDFs with numeric slugs, indicative of a link farm for SEO manipulation. The document body, though partially corrupted, contains text related to 'plan de carrera' and references the wkhtmltopdf tool, suggesting a lure. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves redirecting users to potentially malicious external sites via these numerous links.

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://scenarscot.com/uploads/1/3/1/4/131406505/131406505.html#que+es+un+plan+de+carrera+segun+autores
- http://yukkitasehat.com/uploads/1/3/0/2/130272384/6103830.pdf
- http://phoenixtowingandwrecker.net/uploads/1/3/1/3/131380316/dapadum.pdf
- http://therenterexperience.com/uploads/1/3/0/5/130589299/pugomifogowegivutok.pdf
- http://danielkennedycreates.com/uploads/1/3/0/6/130603928/xenatadapakewuvire.pdf
- http://syjem.org/uploads/1/3/0/2/130273993/b01fd3a1a.pdf
- http://natepupel.com/uploads/1/3/0/6/130605383/265281.pdf
- http://luckywin-autoparts.com/uploads/1/3/0/6/130640179/xerololekuma.pdf
- http://getyourtanon.com/uploads/1/3/1/3/131383721/dezifijanatumugamu.pdf
- http://mikefumes.com/uploads/1/3/0/4/130435780/b4eeed3b1623525.pdf
- http://suigenerismama.com/uploads/1/3/0/6/130604395/fuwemil.pdf
- http://kayhike.com/uploads/1/3/0/5/130543320/pokosut_logugojesebove_diweke.pdf
- http://nucleoama.com/uploads/1/3/0/6/130604292/e3c47.pdf
- http://chasingjon.com/uploads/1/3/0/6/130604731/nedopejipunufoxatab.pdf
- http://cateslist.co/uploads/1/3/0/6/130620556/wigifipej-kejojetosujiva-vixusefada.pdf
- http://where2vacations.com/uploads/1/3/0/6/130620694/fupegoxizip.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_off00012dec.bin` `cc4cc2bb31b1948ca00b713a55d9bffdcd46ffa5344dd33152fc6a221d040f4d`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12DEC	9816 bytes
`font_01_sfnt_off00015098.bin` `f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15098	16204 bytes

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