PDF malware analysis — malicious · 501a05a365ced00f

MALICIOUS

PDF

73.9 KB Created: 2021-09-09 00:36:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: d351d9427908e98641f247ab5fc69c78 SHA-1: 622d3eb659963dbf03c35a2951534702c442599c SHA-256: 501a05a365ced00f7a75bb7b4b531f5232ade21cd7308fa7ef01468137ffb70b

146 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to potentially disposable domains, strongly suggests a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to external malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9956

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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.
QR-code redirect lure medium SE_QR_LURE

Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
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://beeshark.ro/app/webroot/files/userfiles/files/marewamusugigawajo.pdf In PDF document text
- http://custom-mugs-factory.com/uploadfile/files/7855972253.pdfIn PDF document text
- https://www.ijestr.com/ckfinder/userfiles/files/gezubogafozox.pdfIn PDF document text
- http://vetsnab32.ru/userfiles/file/midofamizuluforetagunubi.pdfIn PDF document text
- https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/87009598863.pdfIn PDF document text
- http://corkpotters.com/images/99558205491.pdfIn PDF document text
- http://ippinnudon.com/uploads/files/tebitipere.pdfIn PDF document text
- http://liebherr-tr.com/userfiles/file/28613206038.pdfIn PDF document text
- http://massvt.sk/editor_uploads/system/files/tesofaxanikaladix.pdfIn PDF document text
- http://tbeaindia.com/userfiles/file/66784656485.pdfIn PDF document text
- https://presstone.hu/userfiles/file/56108404192.pdfIn PDF document text
- https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613758035dec5---paxegekikate.pdfIn PDF document text
- http://bluelakehomestay.com/uploads/image/files/56322704429.pdfIn PDF document text
- http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/98595087822.pdfIn PDF document text
- http://mijinmotor.com/fckeditor/userfiles/file/16725848300.pdfIn PDF document text
- https://atl-50.com/files/file/25526913244.pdfIn PDF document text
- http://igs.compcierge-asia.com/ckfinder/userfiles/files/76231157760.pdfIn PDF document text
- http://exima.kr/userData/board/file/77161302733.pdfIn PDF document text
- http://sunnysolutions.it/uploads/assets/file/35041402727.pdfIn PDF document text
- http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16136c1c31726d---70253701445.pdfIn PDF document text
- https://manhremhoangvan.com/wp-content/uploads/files/bujekapujiw.pdfIn PDF document text
- https://sanaspinler.com/calisma2/files/uploads/xotir.pdfIn PDF document text
- http://hanmih.com/userfiles/file/20210905030829.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=mod+apk+for+hungry+sharkPDF link annotation
- 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_off0000be5d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBE5D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d66f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD66F	16936 bytes
SHA-256: `4bfa5220988362847d27d994ca50f393c08afab20ec770c9de691f3742203f29`
`font_02_sfnt_off00010228.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10228	10708 bytes
SHA-256: `e58b66245853906a0368f2825887b6b0d9c333d113b552263ee8ae9d03bd3256`

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