PDF malware analysis — malicious · c15029911e56e9d0

MALICIOUS

PDF

76.7 KB Created: 2021-03-01 18:41:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: de08c7df32868fe317e9ae1f92ec5bc3 SHA-1: becf3f5d47e4de5deb3be9e5fed8a5e2b896490e SHA-256: c15029911e56e9d0c0ca6ac5401bcad7f85f755533d603e5f83234d58c3c7e69

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to SEO-optimized content, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 5

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.
ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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://jacksth.ru/wix?keyword=nythendra+heroic+guide+2018
- https://cdn-cms.f-static.net/uploads/4414352/normal_601d87e7bf46d.pdf
- https://cdn-cms.f-static.net/uploads/4424040/normal_601991f59cbea.pdf
- https://finolija.weebly.com/uploads/1/3/4/6/134625313/a7e422528622.pdf
- https://cdn-cms.f-static.net/uploads/4366035/normal_602948a16dd61.pdf
- https://static.s123-cdn-static.com/uploads/4465133/normal_5feb883da8725.pdf
- https://static.s123-cdn-static.com/uploads/4419826/normal_5ff810ea51133.pdf
- https://static.s123-cdn-static.com/uploads/4393033/normal_5fec355ad596a.pdf
- https://xowunaxevome.weebly.com/uploads/1/3/4/6/134679103/7355795.pdf
- https://cdn.sqhk.co/jipodipotaj/hpAvhfH/off_road_4x4_truck_trails_parking_simulator.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://s3.amazonaws.com/futamo/teliramanoni.pdf
- https://s3.amazonaws.com/punagilelabon/bookkeeping_template_excel_free.pdf
- https://s3.amazonaws.com/geraromu/79375830941.pdf
- https://s3.amazonaws.com/tutasujal/android_default_button_text_color.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_off0000ea82.bin` `91c0b86af2ca314ce9605122e2abe56dab603536bb9ca0f4dcf745ec4e4e9d5f`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA82	5580 bytes
`font_01_sfnt_off0000fd87.bin` `356659fd6d944437acfe2c328a4bf5d59840f16b688ea0eceee57962c05e71ec`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD87	12836 bytes

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