PDF malware analysis — malicious · 8f0d245e0cb81629

MALICIOUS

PDF

84.2 KB Created: 2021-10-10 08:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: 7b0caf9e7534b920d7dc7a7d163e8372 SHA-1: 288675d9556250860f1a793d6667f8280250e5a4 SHA-256: 8f0d245e0cb816297c6ef84c16a2ba3fa6061f21bc52e5e98864f275f1b71c46

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded URLs, many of which are associated with disposable hosting and UTM parameters, suggesting a phishing or link-farming scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=difference+of+could+would+and+should PDF link annotation
- https://paintingwithapassion.com/nbloom/fckuploads/file/25463291515.pdfIn PDF document text
- http://ongxoanhdpe.vn/upload/files/33198225419.pdfIn PDF document text
- http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/femekatibunefuda.pdfIn PDF document text
- http://triatlonbizuterie.cz/sites/default/files/file/razaselesapab.pdfIn PDF document text
- http://thehedgerowchronicles.com/ckfinder/userfiles/files/wewug.pdfIn PDF document text
- http://posekatzahradu.cz/files/file/88487109226.pdfIn PDF document text
- http://myphamso1.net/uploads/files/dikurevulotovitanilide.pdfIn PDF document text
- http://hilimall.ae/uploads/files/36665583950.pdfIn PDF document text
- https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16162302eed8e5---72154991884.pdfIn PDF document text
- https://coil.hk/upload/files/58401263830.pdfIn PDF document text
- https://benqmusicworkshop.com/fupload/file/gidetotalodobamuvudix.pdfIn PDF document text
- http://korsorlampang.net/user_img/files/86451043522.pdfIn PDF document text
- http://otpetye.com/images/shared/file/lenupamujixepad.pdfIn PDF document text
- http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1614403f4dc3cd---mumedoditemevoresasoxuti.pdfIn PDF document text
- https://www.tyrtaios.gr/ckfinder/userfiles/files/38646061317.pdfIn PDF document text
- https://www.blondel-bois.fr/ckfinder/userfiles/files/fibufagegesaderojono.pdfIn PDF document text
- http://polishedskincare.com/minaret/uploads/file/tezomubasimisagofabesil.pdfIn PDF document text
- http://rosg.net/sa_upload/userfiles/file/20211009202519.pdfIn PDF document text
- https://inunekocp.jp/mailmagazine/upload/files/14678776997.pdfIn PDF document text
- http://stjconsulting.it/userfiles/files/virij.pdfIn PDF document text
- http://gazetavk.ru/img/file/18417666671.pdfIn PDF document text
- http://giorgimpianti.com/userfiles/file/68167284726.pdfIn PDF document text
- http://archpiudue.com/userfiles/files/pikugojofafewunopi.pdfIn PDF document text
- https://hkbca.org/UploadFiles/file/20211002200321176.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_off0000de95.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE95	10660 bytes
SHA-256: `91e0b5a171dd63d4e5040851c95bb85e17165d4961cbf742fe1bdaab50e399f2`
`font_01_sfnt_off0000f6f8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF6F8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010f0a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10F0A	19740 bytes
SHA-256: `f92b6e18e708796f87bcc344174e3d227b3dfcabded47cc23ee92ef0e83ff618`

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