PDF malware analysis — malicious · 4d46b1bcfb252479

MALICIOUS

PDF

82.6 KB Created: 2021-09-09 23:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 84b0a6dabd2b9a88447500230990b192 SHA-1: 75596bfc82d99b04602fcc486f00169f33554aed SHA-256: 4d46b1bcfb25247931532e20c385d54619668515b30860780ea504e66ea0ff15

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected by multiple heuristics, including a high-confidence ML classifier and ClamAV, flagging it as malicious phishing content. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting an attempt to distribute malicious content or phish for credentials. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit vulnerabilities or redirect users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 5

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.
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://aprt1day.ru/file/tiletemelebotog.pdf In PDF document text
- https://loctra.net/userfiles/file/sukizejepaxovujilux.pdfIn PDF document text
- https://bevillelecomte.ovh/ckfinder/userfiles/files/wepokutusudugeluxaroxobiw.pdfIn PDF document text
- https://polymadeniyaglar.com/fckeditor/userfiles/file/zafupamenugapezelikamani.pdfIn PDF document text
- http://goldcoil.com/uploadfiles/files/29587469032.pdfIn PDF document text
- http://huarui-bio.com/upload/files/sokutotuweguzaselapiro.pdfIn PDF document text
- https://www.bmo-agencement.fr/ckfinder/userfiles/files/7169797968.pdfIn PDF document text
- https://lazdynumokykla.lt/userfiles/file/nepetexumovatavegeg.pdfIn PDF document text
- http://startent.ru/SITE/files/editor/file/kikaz.pdfIn PDF document text
- http://jncs.kr/page_data/file/20210901092843.pdfIn PDF document text
- https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/zanuvujinozesexejokixu.pdfIn PDF document text
- http://penzion-u-zamku.cz/files/file/44139192220.pdfIn PDF document text
- http://erainbowrealty.com/userfiles/file/lopizunaruzesedizuz.pdfIn PDF document text
- https://mayxaydungthienlong.com/uploads/files/files/40540085426.pdfIn PDF document text
- http://pro-group.ru/userfiles/file/tufixezafopebine.pdfIn PDF document text
- http://gmart-express.com/demo/uploadpic/file/nezelejidajaguwow.pdfIn PDF document text
- https://bahamianbrewery.com/ckfinder/userfiles/files/98556468122.pdfIn PDF document text
- https://benhgout.net/uploads/Files/file/jozimogiponemifugewepux.pdfIn PDF document text
- http://hig-hegmann.de/userfiles/file/vobalomotubekenunal.pdfIn PDF document text
- https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/zozopu.pdfIn PDF document text
- https://ww150001.linebot.net/upfile/files/20210901143559.pdfIn PDF document text
- https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/be9ebbddf8b24d370a5388ddbe0a6579/pasatif.pdfIn PDF document text
- http://motovelo-nmsk.ru/userfiles/file/wukulufojelosinofusor.pdfIn PDF document text
- http://propertiesforrent.com/userfiles/file///3217928244.pdfIn PDF document text
- https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/kogemexabejerejitaji.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=payback+2+game+onlinePDF 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_off0000dd90.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD90	10676 bytes
SHA-256: `311976bada98d75d867f358ea4e5c83b2cf375a3ecbf43a42c962fa5666a1e7d`
`font_01_sfnt_off0000f611.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF611	17756 bytes
SHA-256: `7bc0a765a81b8b15b2d96e56e4e68bc34e8fd1747be45fa05dc0fac9f54523fe`
`font_02_sfnt_off0001246d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1246D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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