PDF malware analysis — malicious · 51a3d3c94e03c7f2

MALICIOUS

PDF

89.1 KB Created: 2021-09-18 00:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: d8630b2fbe79f7bd7a56b705c438e6a3 SHA-1: 3ff424cec4f9ff35014e6f2369a875ea2d83cd83 SHA-256: 51a3d3c94e03c7f2c70838a0df8e622235a6bc3e61e159cee3c51bba33befdbe

166 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm on disposable hosting, with a high-priority finding for a password-protected archive lure. This suggests the PDF is designed to trick users into downloading a payload that is intentionally obfuscated by password protection, likely to evade gateway scanning.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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
Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE

Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
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 http://myshiou.com/uploads/files/202109070848007881.pdf In PDF document text
- https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161401bb6c9b4e---86544890422.pdfIn PDF document text
- https://intrastorg.com/userfiles/file/56374322197.pdfIn PDF document text
- https://pushtypathshala.com/demo/aims/files/images/files/titefobagaguda.pdfIn PDF document text
- http://sozopolihills.com/userfiles/file/51937398995.pdfIn PDF document text
- https://tjpapigroup3.com/contents/files/87774578025.pdfIn PDF document text
- https://bakotech.at/uploads/ckeditor/files/bikuxavudawati.pdfIn PDF document text
- http://hitecds.com/userfiles/file/43340874750.pdfIn PDF document text
- http://mentaplywood.com/images_upload/files/rinarezaluti.pdfIn PDF document text
- http://labonguyenhoang.com/img-chamthi/files/23466671660.pdfIn PDF document text
- http://aisne.proximeo.com/ckfinder/userfiles/files/vegupenidirumisuna.pdfIn PDF document text
- https://marblobaths.com/app/webroot/img/files/61060574382.pdfIn PDF document text
- https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/xezeka.pdfIn PDF document text
- http://www.jucadent.es/ckfinder/userfiles/files/wikadowineje.pdfIn PDF document text
- http://kfnmsz.com/upfolder/e/files/20210902061036.pdfIn PDF document text
- http://purofirstli.net/userfiles/file/75770723410.pdfIn PDF document text
- https://chorland-dining.com/webroot/editor-uploads/files/38090390814.pdfIn PDF document text
- http://cowmoo.org/ckfinder/userfiles/files/89583669931.pdfIn PDF document text
- http://langfordfinancialservices.com/userfiles/files/gufibuso.pdfIn PDF document text
- http://propack-th.com/image/upload/File/bumim.pdfIn PDF document text
- http://lunaleo.pl/userfiles/file/xakemibasovazipazigu.pdfIn PDF document text
- http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422555302ea---wasulinimodimagosatunega.pdfIn PDF document text
- http://stefanourso.com/public/userfiles/file/75541122674.pdfIn PDF document text
- http://www.almansori-ye.com/almansorifiles/files/67262489703.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+recover+data+from+broken+phone+screenPDF 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_off0000f2c2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF2C2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010ad9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10AD9	11124 bytes
SHA-256: `154c5c2367c21eabcc8116d32b8862cd80eadb7243fe9c398a526ceba2e0a166`
`font_02_sfnt_off0001246e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1246E	19448 bytes
SHA-256: `8a70eaff63b9d52f86de025d2b9090ebdff6490cea16f02b90671c8b74bdcef8`

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