PDF malware analysis — malicious · b4681fed8956e132

MALICIOUS

PDF

75.1 KB Created: 2021-09-19 14:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: ba4c4547897d27c3f522d4e2d5a5fc33 SHA-1: 94fa6d640b084527b981986c3b6473fb6acc806f SHA-256: b4681fed8956e132ae22487c277f256e893700addba6407aaf9333ead9bc6e70

146 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 numerous external URIs pointing to disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support this attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9827

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.
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://coretry.ru/uplcv?utm_term=transfer+data+apk PDF link annotation
- https://jurvamartin.com/userfiles/file/pukazuwenarosovobag.pdfIn PDF document text
- http://gmtshipping.com/attachment/file/48188909847.pdfIn PDF document text
- https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/8oq5n0j5iu2tgpt6n2u6o652va/vebigozobotikumatejaxafo.pdfIn PDF document text
- https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf6041aa36---marutalira.pdfIn PDF document text
- http://tjchenxing.com/filespath/files/20210913133021.pdfIn PDF document text
- http://tz5168.com/uploadfile/image/2021/09/03/file/20210903_041740_100.pdfIn PDF document text
- https://listapp.in/ci/userfiles/files/zunusezeduwekin.pdfIn PDF document text
- http://msmzizkov.cz/data/dokumenty/27277188814.pdfIn PDF document text
- https://webmenuplus.com/images/file/begexowamolutaxojixo.pdfIn PDF document text
- http://rydelko.pl/userfiles/file/jiwegab.pdfIn PDF document text
- http://asesoriazabalburu.org/azaba/files/file/rozavepejujizusuronifa.pdfIn PDF document text
- http://21cedu.com/pds/userfiles/files/81548142828.pdfIn PDF document text
- http://fittbikese.hu/files/file/95196467502.pdfIn PDF document text
- http://discus-rus.ru/upl/file/fesig.pdfIn PDF document text
- http://le-lemniscus-incandescent.fr/ckeditor/upload/files/32184431535.pdfIn PDF document text
- https://snf.styleguides.ch/userfiles/files/razogovebuxuxuma.pdfIn PDF document text
- http://seoaudytor.pl/userfiles/file/16393643212.pdfIn PDF document text
- https://linker.tw/files/nusepipe.pdfIn PDF document text
- http://szkolaprywatnaleszno.pl/userfiles/file/84951617716.pdfIn PDF document text
- http://engcaphone.com/_UploadFile/Images/file/nojesu.pdfIn PDF document text
- http://adacu.org/userfiles/file/20210915193029.pdfIn PDF document text
- http://uni-soar.com/userfiles/file/10901030400.pdfIn PDF document text
- https://viadagio.be/userfiles/file/pijewu.pdfIn PDF document text
- http://telek-trans.hu/editor_up/nawiziputileroni.pdfIn PDF document text
- http://vikingpaint.com/user_file/file/lizogogifegasevinigine.pdfIn PDF document text
- http://btsoft.vn/uploads/files/20817935256.pdfIn PDF document text
- http://rewitex.pl/userfiles/file/71022837689.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_off0000c454.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC454	10288 bytes
SHA-256: `5a02cb2e78ced7c673f9ade5b5ceced3043bb0334decea66293d5bfc5d27f56d`
`font_01_sfnt_off0000db9f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB9F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000f3b1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF3B1	16900 bytes
SHA-256: `90515f986e729663b9e221a80895b75d74d84be0e5e251f539bd3c13bbf7fed5`

Open this report in the interactive analyzer, or submit your own file for analysis.