PDF malware analysis — malicious · ed5251f0153b2d7f

MALICIOUS

PDF

78.8 KB Created: 2021-09-16 02:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 373343ebf87a445261a96c81694f8950 SHA-1: 5214e273fe8cb9e395a1e9f65365b6a61fa49ac8 SHA-256: ed5251f0153b2d7ffe8c598814eedbcba8258214db6b8e7f805506da1328081b

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to potentially harmful content, likely for phishing or malware distribution. The presence of external URIs and a link farm heuristic strongly suggests an attempt to trick users into downloading further payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9993

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 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://queure.ru/uplcv?utm_term=gaming+point+apk+download PDF link annotation
- http://kfnmsz.com/upfolder/e/files/20210905013041.pdfIn PDF document text
- http://marcelponjee.nl/ponjeefiles/file/zifajumaxovoradugepe.pdfIn PDF document text
- https://selapro.com.au/application/third_party/ckfinder/userfiles/files/surozegudoki.pdfIn PDF document text
- http://aqbnb.com/uploadfile/file/70912934822.pdfIn PDF document text
- http://indianspringhomes.net/userfiles/files/5807523051.pdfIn PDF document text
- https://locoffice.ru/userfiles/file/18035968493.pdfIn PDF document text
- https://excellencetogether.com/img/files/file/41176491976.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402abbc6ccd---nudaxirofugufomujimoti.pdfIn PDF document text
- http://ajisushionline.com/uploads/files/10450448099.pdfIn PDF document text
- https://fundacjanadzieja.com/images/wyswig_images/file/67450686471.pdfIn PDF document text
- http://frickcontrols.com/uploads/files/keguwasukomezo.pdfIn PDF document text
- https://luxurybaths.marblobaths.ph/app/webroot/img/files/runagidazabexigoka.pdfIn PDF document text
- http://noithatmfc.com/media/ftp/file/bilavaba.pdfIn PDF document text
- http://www.culturehousesun.org/photos/file/1817116453.pdfIn PDF document text
- https://noriupapildu.lt/ckfinder/userfiles/files/dasijinegorubule.pdfIn PDF document text
- http://studiotecniconuti.it/userfiles/files/gokemekolebutusikimirobi.pdfIn PDF document text
- http://canadapremiumlubes.com/survey/userfiles/files/5933040079.pdfIn PDF document text
- https://tolgyesvolgy.hu/userfiles/file/6921767728.pdfIn PDF document text
- http://alituncer.com/userfiles/file/47184418994.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_off0000cf49.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCF49	10552 bytes
SHA-256: `8c82743309d2408ba0c2470a9cbd49d2708811ad704df5f651166120d33a9696`
`font_01_sfnt_off0000e71c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE71C	18400 bytes
SHA-256: `64a51e5ed90e80f261af8667fc658421a32d512260c66e6f67ea6fbd2111dea1`
`font_02_sfnt_off00011600.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11600	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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