PDF malware analysis — malicious · bb0c944ffec379df

MALICIOUS

PDF

81.3 KB Created: 2021-03-06 05:54:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16

MD5: f1ebc2b594805413fbddee78910f85a4 SHA-1: 35fde182f2869647a0fe399351b5c8efadb8d690 SHA-256: bb0c944ffec379dffda09cd926d2961e40a9979ff14bf9b3da6c3d12181ce8d9

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified as a PDF SEO link farm, pointing to various PDF documents. One of these links, https://kuzutuzo.ru/strik?utm_term=what+are+some+flirty+texts, is directly embedded and likely serves as a lure. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

Heuristics 5

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

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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://kuzutuzo.ru/strik?utm_term=what+are+some+flirty+texts PDF link annotation
- https://cdn-cms.f-static.net/uploads/4493266/normal_602ec3f739844.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4379477/normal_5fde684e58ce9.pdfIn PDF document text
- http://investorlands.ru/what_is_tone_of_a_poemub0eu.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4495042/normal_5fc9267c4c55f.pdfIn PDF document text
- http://starkrobotics.org/696749997065k7c.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4413228/normal_6024c57005907.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4468828/normal_600d1085343f7.pdfIn PDF document text
- http://braco.ru/jarazudinafikajgcbw.pdfIn PDF document text
- http://idealica-ufficiale.site/banner_saga_2_wikivbjbq.pdfIn PDF document text
- http://helpverifedbadges.com/83639227411juf0r.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4383327/normal_60029a809be36.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4404528/normal_5ff950cfcfa6b.pdfIn PDF document text
- http://deemonatrafik.xyz/sasalisinekinifup981v.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4376852/normal_602f24c608ce2.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4426059/normal_5fc8c241c62c6.pdfIn PDF document text
- http://legendbilisim.com/234403438135ybie.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4391624/normal_5fef484ece36e.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_f71c13835ab8438aaebf5348bba89c39.pdf?index=trueIn PDF document text
- https://5d3a3edc-1384-4eb0-a354-174dd54c13aa.filesusr.com/ugd/7f5dc5_200384dc92f745d7b461992ab46e0668.pdf?index=trueIn PDF document text
- https://dae57379-2785-4108-a223-4562ecbfc22e.filesusr.com/ugd/87ad98_061af93cd6d84c0982b0566531afe222.pdf?index=trueIn PDF document text
- https://41fe7446-7195-45c8-906d-de5e784989f9.filesusr.com/ugd/e02969_de8980cf95484b72a291447726839fe4.pdf?index=trueIn PDF document text
- https://52ed6390-a5c1-4502-9f93-599cf6d98ad1.filesusr.com/ugd/f7fbc8_7ed4dd8431dd41ef86bd854782252c2e.pdf?index=trueIn PDF document text
- https://18d8f76e-0bdd-4b96-b744-fee987eed1b0.filesusr.com/ugd/1486c8_69d155d9187841ebaae8865835894fc6.pdf?index=trueIn PDF document text
- https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_bb40ca0749a14033bf3b00c94349a513.pdf?index=trueIn 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
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ed37.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED37	5188 bytes
SHA-256: `a8e8d91556372838db6fef895994c85d6d3fee1b7e9585ce6bacb88dd1348dec`
`font_01_sfnt_off0000fecb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFECB	10320 bytes
SHA-256: `03a1b1bb8a8eff57b439e4e776d9ea8fa0dd7028227b8c90ed0aedc38dc5ff96`
`font_02_sfnt_off0001225a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1225A	16168 bytes
SHA-256: `e5458d7b6d82539349b17fc4713a17e1381d471255c72d9f8116b7c86e08c443`

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