PDF malware analysis — malicious · fd0dbfb57d6fa3e2

MALICIOUS

PDF

74.3 KB Created: 2020-12-24 17:32:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04

MD5: a1cae42d597af5518c0412b8045f5527 SHA-1: 97716747ab3124c20695517ee02012a363b37868 SHA-256: fd0dbfb57d6fa3e2798b31a964356276212821b2fc4ea4e42b82305f0d89dad3

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://trafficel.ru/123?utm_term=endothermic+vs+exothermic+phase+changes PDF link annotation
- https://nogafuku.weebly.com/uploads/1/3/2/8/132815296/f2d5a8f7a66cc.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4374177/normal_5f9d516a5de4a.pdfIn PDF document text
- https://cdn.sqhk.co/wemupaxuziv/geyjfif/30075155742.pdfIn PDF document text
- https://cdn.sqhk.co/kapopajij/NidzhfN/cookie_recipe_without_eggs_and_flour.pdfIn PDF document text
- https://terarawuterojuz.weebly.com/uploads/1/3/0/7/130739827/dazudinulusabuw-gizum-zejarosemiwanet-matepod.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://s3.amazonaws.com/gidibesuxi/gumewodenuvawijitimobip.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/fe1241ed-1c0d-4519-bf54-6e1cc8e7a62b/51753059053.pdfIn PDF document text
- https://s3.amazonaws.com/taturi/tifodanunegutizem.pdfIn PDF document text
- https://s3.amazonaws.com/tobovunoberiki/apa_publication_manual_2010.pdfIn PDF document text
- https://s3.amazonaws.com/punurum/guidelines_vascular_access_dialysis.pdfIn PDF document text
- https://s3.amazonaws.com/potofaw/82024670224.pdfIn PDF document text
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e47f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE47F	5540 bytes
SHA-256: `ca32477bfce8d61399f586ddec454b207ef6513e034c6184abaac32a05dadeab`
`font_01_sfnt_off0000f73b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF73B	10984 bytes
SHA-256: `49df0b7cd5385d532dacb6acc77d633f8a4ffe158efbf8d38224fe16a28fb062`

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