PDF malware analysis — malicious · 4579dcc33bca2e88

MALICIOUS

PDF

75.3 KB Created: 2021-03-22 21:27:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25

MD5: a5f41e9ee7e639ea298a03128afc562a SHA-1: aa4803cdc19679837811a5faaf355e7adaf16db9 SHA-256: 4579dcc33bca2e881533057028cc3e6ac212491510180487ff46c310375cd00c

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious campaign, possibly using SEO techniques to lure victims.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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
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.
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://bologen.ru/wix?keyword=austin+first+church+facebook PDF link annotation
- https://komibaxes.weebly.com/uploads/1/3/1/6/131606619/7518276.pdfIn PDF document text
- https://buporinedo.weebly.com/uploads/1/3/4/0/134041533/warunekuw.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4466153/normal_602ebf2205edf.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4495037/normal_5fe5121e51275.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4445890/normal_5fcced8dee221.pdfIn PDF document text
- https://gitexerepasali.weebly.com/uploads/1/3/4/5/134577484/tujuxekipitevelozija.pdfIn PDF document text
- https://monijakuxit.weebly.com/uploads/1/3/4/3/134362478/f13962.pdfIn PDF document text
- https://pawomasa.weebly.com/uploads/1/3/4/7/134737305/874634.pdfIn PDF document text
- https://siwinapevaz.weebly.com/uploads/1/3/4/3/134338690/421ebe5e3b1.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4483587/normal_6041848e85581.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4456660/normal_600059b2cb9db.pdfIn PDF document text
- https://kezarixanutoge.weebly.com/uploads/1/3/4/3/134372428/jirumusevizako.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4418001/normal_5fe21d5d57987.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_fe530c1941d24dbf8aef565a1563d440.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/xomepixo/can_eating_gluten_free_food_give_you_diarrhea.pdfIn PDF document text
- https://f495c71d-628d-4070-9a3d-b699cbb46ba4.filesusr.com/ugd/d99ef3_f18c371e723349ee9ee4745907b03885.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/wazorixekunafob/atlantis_dubai_images.pdfIn PDF document text
- https://s3.amazonaws.com/zarevizebi/from_flask_import_flask_render_template_url_for_request.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
- 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_off0000d27d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD27D	5132 bytes
SHA-256: `88f053dc3558ac3f4c76df95c12b795ec389964e1ad81b1da647cafa732cdedb`
`font_01_sfnt_off0000e3f2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE3F2	11812 bytes
SHA-256: `615181f341c91ab89ff6de0fbe5ec6d71ceb10b2759803adb924b42895eda156`
`font_02_sfnt_off00010ae3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10AE3	16204 bytes
SHA-256: `a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd`

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