PDF malware analysis — malicious · 25be81d3bb181927

MALICIOUS

PDF

77.5 KB Created: 2021-09-12 11:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20

MD5: fbffb4f3a6e392fff9913b32438e252d SHA-1: deadd593b1aa3a44f626e92d9b1f05bab36b4761 SHA-256: 25be81d3bb181927ec2e422c83ea6f65f152e6e19f3bf1283f32a4263efcc450

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs, many pointing to unknown or potentially malicious domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the true destination by using multiple distinct hosts. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure strongly suggest an intent to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9953

Heuristics 5

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.
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://houtackers.nl/userfiles/file/nafukatororobibuka.pdf In PDF document text
- https://generalaudit.pl/eurostyl/photos/file/noxogutudiwofabegaju.pdfIn PDF document text
- http://www.gdchgs.com/admin/img/files/paxupiwajono.pdfIn PDF document text
- http://xn--krmer-dnnebacke-1kb72b.de/files/file/dilowesutedinodik.pdfIn PDF document text
- http://presssimayeshahr.ir/pic/file/bezufadewuxamarifuromelon.pdfIn PDF document text
- https://atavio.ru/files/file/sokinuliguzovux.pdfIn PDF document text
- http://4reality.cz/userfiles/files/83604860563.pdfIn PDF document text
- http://elitvorota.ru/f/file/96424982659.pdfIn PDF document text
- https://oceanflowerhotel.com/uploads/image/files/43654079233.pdfIn PDF document text
- http://odesignlab.ru/admin/ckfinder/userfiles/files/53169230728.pdfIn PDF document text
- https://somogyplusz.hu/files/53693782322.pdfIn PDF document text
- http://seamacros.com/upload/file/lugativezamawokagulujidep.pdfIn PDF document text
- https://stmarys-perthamboy.com/upload/File/11473174433.pdfIn PDF document text
- https://gamepinleri.com/calisma2/files/uploads/28636950053.pdfIn PDF document text
- https://nstoplana.rs/ckfinder/userfiles/files/33773101482.pdfIn PDF document text
- https://tigapilar.com/upload/files/fifakakitude.pdfIn PDF document text
- https://paymentor.nl/uploads/file/14449515687.pdfIn PDF document text
- https://hankilfood.com/userfiles/file/20210911085913.pdfIn PDF document text
- http://cokhixnktientien.com/Images_upload/files/99776255092.pdfIn PDF document text
- https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f819ad0ec6---55769270565.pdfIn PDF document text
- https://led7.ru/file/xobonu.pdfIn PDF document text
- http://thewellmanteam.com/userfiles/files/43827381307.pdfIn PDF document text
- http://catherine-massage.com/ckfinder/userfiles/files/8709996618.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=audio+extractor+androidPDF 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_off0000cc4c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCC4C	10332 bytes
SHA-256: `13d960ca80fb26db99436321a33cee689ce0f4e0d3e6210948bee21ad6dd73b4`
`font_01_sfnt_off0000e3c0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE3C0	17280 bytes
SHA-256: `106c29432bc5b69991d536c7714f8f6370995e1458d1c1fc1b101288e627cb48`
`font_02_sfnt_off000110d0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x110D0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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