PDF malware analysis — malicious · 36c242a6d9b41e0e

MALICIOUS

PDF

80.2 KB Created: 2021-09-11 06:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 46523f51433a95bda9260354a7a0ce80 SHA-1: 8e048532f43cd5407b68a05c553639e683dc8d2f SHA-256: 36c242a6d9b41e0e5bf74972535e641890909088d58c04ce0bfffbe74ecc3a6a

134 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a large number of external URLs, suggesting it is designed to redirect users to malicious sites, likely for phishing or to download further payloads. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that the document is part of a link farm designed to distribute malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

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://cructi.ru/uplcv?utm_term=gd+subzero+mod+apk PDF link annotation
- https://butyfarm.mm520.net/userfiles/files/23092428022.pdfIn PDF document text
- https://nutricount.cz/UserFiles/File/kedizalisirawofu.pdfIn PDF document text
- http://sobinco.cz/ckfinder/userfiles/files/62502838838.pdfIn PDF document text
- https://motiwalainstitutes.org/userfiles/file/pifukabinofevozeju.pdfIn PDF document text
- http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/161328a61b725e---zamevebujaj.pdfIn PDF document text
- https://studioconcept-stand.com/fck_userfiles/file/25521549374.pdfIn PDF document text
- https://phatgiaolongan.com/upload/ckupload/files/xusen.pdfIn PDF document text
- https://accounting789.com/ThImg/file/64380642107.pdfIn PDF document text
- http://ototavandosemesi.com/resimler/file/fugaledenimituxoke.pdfIn PDF document text
- http://illinoislivestock.org/userfiles/file/81302373134.pdfIn PDF document text
- http://ap116.ru/userfiles/file/fizesopobubawudorefesilew.pdfIn PDF document text
- http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136192f83374---gizirawagorepaginesevazi.pdfIn PDF document text
- https://yptea.com/data/fckeditor/files/ranurimemigubonaxu.pdfIn PDF document text
- http://cissi.it/userfiles/files/91736208494.pdfIn PDF document text
- https://linker.tw/files/57971855674.pdfIn PDF document text
- http://moneymaker-gold.de/files/94128259488.pdfIn PDF document text
- https://imahima.xyz/js/ckfinder/userfiles/files/gosakaras.pdfIn PDF document text
- https://braindevelopmentmaps.org/userfiles/files/34944990430.pdfIn PDF document text
- http://szyoujin.com/UploadFile/file/20210907160759931.pdfIn PDF document text
- https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/sabadaropiw.pdfIn PDF document text
- http://md-servicios.com/userfiles/file/83619265749.pdfIn PDF document text
- http://ivankotov.ru/img/lib/file/40362171661.pdfIn PDF document text
- http://akkoryazilim.com/userfiles/file/novevesejaxesipaviwitowa.pdfIn PDF document text
- http://pijntherapie.be/uploads/files/20765808454.pdfIn PDF document text
- http://playoz.com/ckfinder/userfiles/files/21467750893.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_off0000d606.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD606	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ee1d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE1D	10644 bytes
SHA-256: `c0ce4884d0cdd1770b8d7787b250c98b03f42f00733bb2f4ab7c33b9143ab727`
`font_02_sfnt_off00010653.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10653	17500 bytes
SHA-256: `dd4b6326208fff1e26e70ecb5b2d7e7f5545b78d49f6f8b58d79ea93c1a610dc`

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