PDF malware analysis — malicious · e63dc3254a143659

MALICIOUS

PDF

85.3 KB Created: 2021-09-17 05:23:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 7e1c739b58c5a132fc336e422acf38d1 SHA-1: d2f01162e228ed459e5632d529cd5ab668aa8a2d SHA-256: e63dc3254a14365900a4fd8e6c40de217fccf22cb9d3158f22f363dda1be7b28

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this conclusion.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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
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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://ketchas.ru/uplcv?utm_term=maths+warm+up+year+3 PDF link annotation
- http://lgassociates.in/uploads/zigudekalijofa.pdfIn PDF document text
- https://jiu-hang.com/upfiles/editor/files/53382952504.pdfIn PDF document text
- http://studiotecnicomartani.eu/userfiles/files/28342242650.pdfIn PDF document text
- http://imosa.asia/uploads/files/202109140704572792.pdfIn PDF document text
- http://kientrucsangtrong.com/plus/files/52217890267.pdfIn PDF document text
- http://dush-kz.ru/uploads/fck/file/59395782367.pdfIn PDF document text
- https://rwd.webseo.tw/upload/files/tebopudeno.pdfIn PDF document text
- http://lnv-cnc.gr/userfiles/file/lilis.pdfIn PDF document text
- https://ipekyolumedya.com/resim_galeri/file/80828139210.pdfIn PDF document text
- http://intrinhgia.com/admin/webroot/upload/image/files/mojowatag.pdfIn PDF document text
- http://abbuffalowings.com/uploads/files/65381199928.pdfIn PDF document text
- https://robindayne.com/ckfinder/userfiles/files/jejapinamilalakanipesenej.pdfIn PDF document text
- http://aallergy.netlovestories.com/upload/files/sajazameripuxu.pdfIn PDF document text
- http://wisdomtours.net/upload/file/zadakatumunixajefawigafu.pdfIn PDF document text
- http://stisk.com/file/20000248475.pdfIn PDF document text
- https://mvmdigital.gr/files/files/6529064175.pdfIn PDF document text
- http://studioguagnoni.it/userfiles/files/veboraloxowokasewinupe.pdfIn PDF document text
- http://tonghuichem.com/upload/files/15848601642.pdfIn PDF document text
- http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/28371725043.pdfIn PDF document text
- https://k31szmq42-nu28.com/contents/files/gunugex.pdfIn PDF document text
- https://partroyfuneralhome.com/partroy/assets/file/74497993083.pdfIn PDF document text
- http://orosweb.hu/ckfinder/userfiles/files/4165981114.pdfIn PDF document text
- http://harnettcountyhba.com/userfiles/file/gijulajilajilip.pdfIn PDF document text
- http://udaybharat.in/ckfinder/userfiles/files/84100119755.pdfIn PDF document text
- https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af8e421409---siliwopagaginameja.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_off0000e614.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE614	10620 bytes
SHA-256: `15e509c7fe9922af24fdb1be07bb1b43e55522b95d42ecfbaada79ca2e01607c`
`font_01_sfnt_off0000fe82.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE82	18764 bytes
SHA-256: `06d8e3586771d87e9af87f337fb04a32cbb4c67943fb3552533de7a20eb6c3cf`
`font_02_sfnt_off00012f88.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12F88	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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