PDF malware analysis — malicious · a3b6d76537d593d1

MALICIOUS

PDF

90.2 KB Created: 2021-09-19 06:38:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: e9d4bd1dc80d2a8a29d096d7f60f0ed8 SHA-1: 84ab768a449d7e70df3c5bfd078a2c96907457e2 SHA-256: a3b6d76537d593d10a28e53ea21852fe6fdbb5ebebb29d56957ca3f729e8d4c5

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and the presence of external links are consistent with techniques used to deliver second-stage payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9971

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 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.
Urgency / deadline lure low SE_URGENCY_LURE

Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
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://pixomot.ru/uplcv?utm_term=how+to+use+firestick+remote+app+without+wifi PDF link annotation
- http://ilink.pl/userfiles/file/kamutezuzokomi.pdfIn PDF document text
- http://cochemical.com/upload/files/vojikoteke.pdfIn PDF document text
- https://safewatersolutions.in/ckfinder/userfiles/files/34257545756.pdfIn PDF document text
- http://yuanjiangchem.com/upload/files/68980456261.pdfIn PDF document text
- https://scalping.ir/data/files/file/59692279786.pdfIn PDF document text
- http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/72638958742.pdfIn PDF document text
- http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1e7b70840---jafexijifajozun.pdfIn PDF document text
- http://zoekidsworld.com/userfiles/file/lozawagekiluda.pdfIn PDF document text
- http://aokunoil.com/ckfinder/userfiles/files/31778126874.pdfIn PDF document text
- https://hram-uspeniya.ru/ckfinder/userfiles/files/suregazibolivevugopu.pdfIn PDF document text
- https://kamhosting.nl/ckfinder/userfiles/files/bifogozagujisobuxe.pdfIn PDF document text
- https://hoangphatdanang.xetnghiemadndanang.com/uploads/image/files/wojigubezivexigafelud.pdfIn PDF document text
- http://www.jasfec.com/imgs/uploads/nifanilavipigapomuk.pdfIn PDF document text
- http://saringkarnwood.com/UserFiles/file/wubelero.pdfIn PDF document text
- http://msinziniering.com/userfiles/file/11081563348.pdfIn PDF document text
- http://wwm-quanta.com/upload/files/romubotekari.pdfIn PDF document text
- https://pastijptoto.com/contents/files/66964802753.pdfIn PDF document text
- https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/91157561637.pdfIn PDF document text
- http://montoaneli.com/ckfinder/files/23507017817.pdfIn PDF document text
- https://atlanticcompact.org/userfiles/files/72163563615.pdfIn PDF document text
- http://sklepjola.pl/userfiles/file/37884575066.pdfIn PDF document text
- http://tweddlefoto.com/files_contenidos/upload/files/betowagivimoremovo.pdfIn PDF document text
- http://elard-group.com/ckfinder/userfiles/files/kibuzabugozegevazim.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://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_off0000f557.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF557	10864 bytes
SHA-256: `f77a4f561447413745f6829f472632bc3d8d1c6e46833cf1a3f7bd5ff848e080`
`font_01_sfnt_off00010e8d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E8D	19844 bytes
SHA-256: `d7389819c78326f60ad701eb0111689d2bde5abb937d723cb216ea698f9b01c1`
`font_02_sfnt_off000142a1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x142A1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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