PDF malware analysis — malicious · 782665b05379edbc

MALICIOUS

PDF

74.5 KB Created: 2021-02-24 22:24:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14

MD5: 22649cbe41c82aef5e612cac992ffc1c SHA-1: 889e0870ac03e8cc698a911bc118395351eb44e9 SHA-256: 782665b05379edbc82a5fe90d7f40dbf60447622207cbba23528d7d9592156c7

244 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links pointing to various external PDF files, many hosted on disposable domains. One critical heuristic indicates these links are part of a redirector infrastructure, and another identifies it as a link farm on disposable hosting. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for SEO manipulation or to distribute further malicious content. No scripts were extracted, but the embedded links are the primary indicators of malicious activity.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 6

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

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK

PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
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.
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
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://crophysi.ru/strik?utm_term=epson+v550+scanner+best+price In PDF document text
- https://cdn-cms.f-static.net/uploads/4369508/normal_601cb4e2df3cf.pdfIn PDF document text
- https://woxazalaxit.weebly.com/uploads/1/3/4/2/134235403/1924c65.pdfIn PDF document text
- https://xesisawizes.weebly.com/uploads/1/3/1/6/131606125/juxita_podazolo_nidokinuvat_vezefevititexa.pdfIn PDF document text
- https://buwigare.weebly.com/uploads/1/3/5/3/135308802/6602ef8.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4420588/normal_602db049aae24.pdfIn PDF document text
- http://teachersaid.fun/fallout_shelter_pc_cheat_engine_lunchbox7u32l.pdfIn PDF document text
- https://serorufadorulu.weebly.com/uploads/1/3/1/4/131483245/gadelot_jewuvapise_vasixefuwozomip_nigumisiz.pdfIn PDF document text
- http://igafnd.org/skate_art_3d_apk_downloaditplt.pdfIn PDF document text
- https://xifuvago.weebly.com/uploads/1/3/0/8/130813557/04e6f282c.pdfIn PDF document text
- http://3-bureaureport.info/goneruxel5t16c.pdfIn PDF document text
- https://xonuguzuv.weebly.com/uploads/1/3/1/3/131382030/7c53bc6.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4383679/normal_600f14aa32ca4.pdfIn PDF document text
- https://reropazorulofo.weebly.com/uploads/1/3/4/4/134437501/789090.pdfIn PDF document text
- https://fiwisito.weebly.com/uploads/1/3/4/7/134715438/gerefub_budada_ludesoba.pdfIn PDF document text
- https://ralubimuxafoku.weebly.com/uploads/1/3/4/3/134373731/mitezesi_zoketu.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4375075/normal_6031e7bd43853.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4454811/normal_60078b6f2204f.pdfIn PDF document text
- https://vokarojunez.weebly.com/uploads/1/3/2/6/132696330/tevuriferosev.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e525.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE525	5316 bytes
SHA-256: `ffbd74b6ad3b545fc350b69f5c169db5f2cddf57d8d3c9c37bde3f56358dd137`
`font_01_sfnt_off0000f751.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF751	11040 bytes
SHA-256: `d130769ede04db95861adc1227b8087d7959627374a75d27ff62206fc730ea7b`

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