PDF malware analysis — malicious · 78e1f63d05b03ed0

MALICIOUS

PDF

73.3 KB Created: 2021-09-16 18:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: bb65ffc2b5c0671aad2aad8dd3d93c7c SHA-1: f63966ceb6c8540bfeb7679dba876af8a71ab23c SHA-256: 78e1f63d05b03ed0cacc4a2e39cba6df7ce13f744bcb5a839fb326ea4f966ff6

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a high number of embedded URLs, many pointing to potentially malicious domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating an attempt to distribute links across many disposable hosts. No scripts were extracted, but the overall structure points to a malicious document designed to redirect users to external sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9927

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://uspeh-kursk.ru/ckfinder/userfiles/files/81144350704.pdf In PDF document text
- https://birutelorasin.com/contents/files/zonivex.pdfIn PDF document text
- http://debseven.net/UserFiles/File/judinunegolofofamukol.pdfIn PDF document text
- http://saeronbio.com/userData/board/file/6292369396.pdfIn PDF document text
- http://kcpsystem.com/userData/board/file/28484471706.pdfIn PDF document text
- https://energooptima.hu/upload/File/51619499170.pdfIn PDF document text
- http://eprdel.cz/userfiles/file/38198951441.pdfIn PDF document text
- https://bunian-co.com/other_files/File/79631027402.pdfIn PDF document text
- http://www.cerel.eu/images/wyswig_images/file/xufavawunok.pdfIn PDF document text
- https://consultemergingmarkets.cubsindia.com/files/tisegukimilavesefinamuj.pdfIn PDF document text
- http://riph.pl/userfiles/file/57703397390.pdfIn PDF document text
- https://www.bmo-agencement.fr/ckfinder/userfiles/files/54103514873.pdfIn PDF document text
- http://strap.sk/uploads/files/zovobupililugej.pdfIn PDF document text
- http://fpempresa.cen.es/userfiles/files/kupuranewadefejilux.pdfIn PDF document text
- https://zzwgjx.com/d/files/37570547869.pdfIn PDF document text
- https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7c22487ca---3036166486.pdfIn PDF document text
- http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gofagesivo.pdfIn PDF document text
- http://gpmpoolandspa.com/ckfinder/userfiles/files/bobujovu.pdfIn PDF document text
- http://eternoohydro.com/d/files/gigopubagisinujitimi.pdfIn PDF document text
- https://kaowei.tw/image/files/20210916_213745.pdfIn PDF document text
- https://photofetimages.com/gawoduso.pdfIn PDF document text
- https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161411ef5eff30---tegogojafeladus.pdfIn PDF document text
- http://gruppocinofilomarsalese.com/userfiles/files/73380329044.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=asphalt+hack+apkPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000b0fb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB0FB	18940 bytes
SHA-256: `5cd670439c120af218d8400de00d2945e5b89fb1bb49c2d849d80f0194c4d013`
`font_01_sfnt_off0000e05f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE05F	9996 bytes
SHA-256: `3e76f2db91df71a456852bc716920efede24efd9971b1dddac8535dd9be2ad02`
`font_02_sfnt_off0000f6bf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF6BF	1840 bytes
SHA-256: `e11639021ae82bc81d66597892112dbefd7f2cb67f426bbebb6fc3c29591e729`
`font_03_sfnt_off0000ff66.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF66	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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