PDF malware analysis — malicious · 878631f5e41ada28

MALICIOUS

PDF

80.5 KB Created: 2021-09-16 02:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 4b4a29af6b70077d5b7822c409a487c8 SHA-1: 758df047a1db71bfbc8ef8401ad61a26ca9794e4 SHA-256: 878631f5e41ada28a89cc8c956b0992eff83215dd52a158bf0216ddf8e6ae239

166 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The presence of numerous external URIs and the 'Password-protected archive handoff' heuristic suggest the document is a lure to trick users into downloading a password-protected payload, likely to bypass gateway security. The embedded URLs point to various domains, many of which appear to be link farms or disposable hosting, further supporting a phishing or malware distribution scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9953

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
Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE

Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
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://crewmak.ru/uplcv?utm_term=messenger+premium+mod+apk PDF link annotation
- http://birizgardenhotel.com/userfiles/file/22270344206.pdfIn PDF document text
- http://fantacyhandicraft.com/userfiles/file/89803073679.pdfIn PDF document text
- https://anup.bo/images/files/zigevamitugofi.pdfIn PDF document text
- https://topconta.ro/userfiles/file/vikaxixufuke.pdfIn PDF document text
- http://nationalherbo.com/userfiles/file/11612186673.pdfIn PDF document text
- https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613649c057d03---35513315663.pdfIn PDF document text
- https://escritacontabilidade.net/fotos/news/file/93689357312.pdfIn PDF document text
- https://lufty.cz/UserFiles/files/77861542651.pdfIn PDF document text
- http://clubmaniacr.com/campannas/file/zedun.pdfIn PDF document text
- http://www.primariasantana.ro/uploads/file/susezevegakexifixiv.pdfIn PDF document text
- https://jordan.si/dokumenti/file/34283877371.pdfIn PDF document text
- http://cross-winds.in/upload/contents/images/images/fagukufira.pdfIn PDF document text
- http://marienoellebermond.com/img/uploaded/file/selojixomunapitukafem.pdfIn PDF document text
- https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/dupobetox.pdfIn PDF document text
- http://bensonlandscape.com/editorData/file/82969547561.pdfIn PDF document text
- http://goodtraefarm.com/ckupload/files/kisuzebukagaliwigowijik.pdfIn PDF document text
- http://geoodwierty.pl/files/file/lumexofuboxowizojugag.pdfIn PDF document text
- https://danielstrehlau.com/userfiles/file/1432483108.pdfIn PDF document text
- http://jedzenie365.pl/ckfinder/userfiles/files/fipapa.pdfIn PDF document text
- http://15441707.com/data/board/file/20210902235353.pdfIn PDF document text
- http://gusanhightec.com/userData/board/file/dexodizife.pdfIn PDF document text
- https://univerosg.com/ckfinder/userfiles/files/88332369102.pdfIn PDF document text
- http://yucehukuk.com/resimler/files/84609644202.pdfIn PDF document text
- http://zhjpharm.com/upload/files/fegetikojixugiwe.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_off0000d691.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD691	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000eea8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEEA8	10776 bytes
SHA-256: `1560e3ed6357f16e6718b6f213ab3142977fcac1d7a7f4f8589ac94e69f8ff73`
`font_02_sfnt_off0001073a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1073A	17748 bytes
SHA-256: `fab16ad2990d3440f1738e08e96f49a74276324df4319cacddf9956041ceca69`

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