PDF malware analysis — malicious · d26aeb575036924c

MALICIOUS

PDF

71.2 KB Created: 2021-09-20 06:33:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: f6ee9dd250dd68093f091cca1ce60ea9 SHA-1: fc6680ab8e4e6f660a9f448238e459fe7af95684 SHA-256: d26aeb575036924c9816238a6cbe6e6368118c4a892e08dabdbadbd92598c1b8

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a large number of external URIs, many pointing to disposable hosting, strongly suggests a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is part of a link farm designed to obscure malicious activity.

Machine Learning

Nyx PDF Classifier malicious score 0.9840

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://nomylo.ru/uplcv?utm_term=how+to+cache+data+in+android PDF link annotation
- https://iwistw.com/upload/files/85127648565.pdfIn PDF document text
- http://ourdesign.hk/ckfinder/userfiles/files/jinuwipixej.pdfIn PDF document text
- http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161422399940a5---vivanama.pdfIn PDF document text
- http://heydarbaba.org/resimler/files/wadebudiliviwutupibibef.pdfIn PDF document text
- https://adikkeempat.com/contents/files/navotanujif.pdfIn PDF document text
- https://newcar-rental.com/uploads/files/202109090349199711.pdfIn PDF document text
- http://budapestpainter.hu/ckfinder/userfiles/files/rogejewizumefegumoro.pdfIn PDF document text
- http://inteko-tula.ru/f/file/78492156659.pdfIn PDF document text
- http://wingmanresearch.com/userfiles/files/robumebegoruji.pdfIn PDF document text
- http://ljjxmining.com/uploadfile/file///2021091022112947.pdfIn PDF document text
- http://langmoon.jp/js/upload/files/89502191487.pdfIn PDF document text
- https://santa.sg/images/users/00000000/files/88650635584.pdfIn PDF document text
- http://steelbo.com/uploads/admins/u0/files/20210911130736.pdfIn PDF document text
- https://hiroyoung.com/data/files/66385923901.pdfIn PDF document text
- http://dr-temt.ru/images/file/zodusuritukafovesisek.pdfIn PDF document text
- http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/181647354050.pdfIn PDF document text
- https://markapin.com/calisma2/files/uploads/68497810977.pdfIn PDF document text
- http://www.boldino-hotel.com/ckfinder/userfiles/files/doretexowizoratagix.pdfIn PDF document text
- http://cp-tournament.org/ckfinder/userfiles/files/vunit.pdfIn PDF document text
- http://marymo.ru/uploads/files/27831905240.pdfIn PDF document text
- http://tranindo.com/Uploads/userfiles/files/64179530988.pdfIn PDF document text
- http://anpo.vn/upload/files/tisavaxopezonapujotoje.pdfIn PDF document text
- http://kowel.com/ckfinder/userfiles/files/1631819704.pdfIn PDF document text
- http://moscowprice.com/content/xuploadimages/file/13097136345.pdfIn PDF document text
- http://marinaxaraes.com.br/ckfinder/userfiles/files/91192279920.pdfIn PDF document text
- http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309160e4856---wurajelilixoxov.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_off0000b8dc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB8DC	10332 bytes
SHA-256: `1702fc9a8fca98cf3f1d3832a6d6370ce46c99a94d8b3729638d751a1f2ccc61`
`font_01_sfnt_off0000d019.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD019	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000e82b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE82B	15372 bytes
SHA-256: `785d7cde3d2be8a653a9801608e1675fbbac6fc2a4e6c0fdac6871119e8da222`

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