PDF malware analysis — malicious · 3bfea9e4c96c5420

MALICIOUS

PDF

76.2 KB Created: 2021-09-18 03:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: b9794358bd7d9c8af7c1868878efe4e0 SHA-1: 950e26f48481dcc593dd933a9361e73cd8765a63 SHA-256: 3bfea9e4c96c542054cf8052f3bd362db78b95fd33f4bcda9d6001b79ac0235f

134 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. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the attack pattern of using the document as a lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9948

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://huntic.ru/uplcv?utm_term=new+sinhala+songs+mp4+download PDF link annotation
- http://brno-skoleni.cz/ckfinder/userfiles/files/88167362648.pdfIn PDF document text
- https://we-plus.tw/ckfinder/userfiles/files/gizononomorifekumizuso.pdfIn PDF document text
- http://talesma.com/E/file/45191275527.pdfIn PDF document text
- http://stluciachamber.org/uploadedImages/contentImg/file/34378898778.pdfIn PDF document text
- https://healthlantern.com/ckeditor/ckfinder/userfiles/files/rinidolewirafotim.pdfIn PDF document text
- http://grafichesirio.com/userfiles/files/buvilejiruzowivarawon.pdfIn PDF document text
- http://billedbutikken.dk/articlefiles/file/weweje.pdfIn PDF document text
- http://auswallendorf.de/userfiles/file/64051126436.pdfIn PDF document text
- http://i-daa-wl.de/userfiles/farunopujupugawugus.pdfIn PDF document text
- http://csc-028.com/userfiles/file/20210911202707_ojjkl8.pdfIn PDF document text
- http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d12adcfae---wadodanewo.pdfIn PDF document text
- http://damutech.kz/upload/2021/09files/2109011316589884242yikm.pdfIn PDF document text
- http://melly-incendie.fr/img_db/5232890999.pdfIn PDF document text
- http://espacioschillout.es/images/admin/file/64774054016.pdfIn PDF document text
- https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/gavaromumaw.pdfIn PDF document text
- https://bimetoor.com/basefile/bimetoorir/files/fowixelibolapot.pdfIn PDF document text
- http://thehedgerowchronicles.com/ckfinder/userfiles/files/96722103225.pdfIn PDF document text
- http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/najarujup.pdfIn PDF document text
- http://uzunlarpeynir.com/dursun/upload/files/78183621214.pdfIn PDF document text
- https://texigo.tw/upfile/files/2021/09/08/91222264516.pdfIn PDF document text
- https://economiadecomunion.com/ckfinder/userfiles/files/femesoxamegaxediremubar.pdfIn PDF document text
- http://chia4kids.ru/ckfinder/userfiles/files/gabajiloxudikun.pdfIn PDF document text
- https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0f9295a72---3967021050.pdfIn PDF document text
- https://vegan-eshop.cz/data/file/tebam.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_off0000c518.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC518	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000dd2a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD2A	17636 bytes
SHA-256: `08ffab22b75507eedec2d19e5115b5d707b0b9d057c3058e55469690b0b52477`
`font_02_sfnt_off00010b05.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B05	10780 bytes
SHA-256: `b89c10868d10f337c0cb9ea0a8b6b4fda5c74ea7e9a6577015ad2480d7ec9a9c`

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