PDF malware analysis — malicious · e86f89874cd312df

MALICIOUS

PDF

68.8 KB Created: 2021-09-26 03:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 0d713b94fbe852c7108cf672a1a1c9ca SHA-1: f28e0b8db3b2ec00a4f1cdbed638f5d416ef9bff SHA-256: e86f89874cd312dfa47e9cc9830c48e5f0777fe661a5401d84ac8ad84de771f9

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 numerous external URLs, many pointing to PDF files on potentially disposable domains, suggests a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm designed to obscure the true destination.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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 http://tandprotheses.com/ckfinder/userfiles/files/sixigamilatimiponi.pdf In PDF document text
- http://bbfederico2.net/userfiles/file/17159231180.pdfIn PDF document text
- http://webbuilders.com/files/file/92281454750.pdfIn PDF document text
- http://cyklo-sport-servis.cz/UserFiles/File/pajage.pdfIn PDF document text
- http://werkkledingverkoop.nl/images/docman/files/galibediropidezelif.pdfIn PDF document text
- http://tochuchoinghi.org/files/kasupopojo.pdfIn PDF document text
- http://atamergranit.com/userfiles/file/bimebefutuxajozojifav.pdfIn PDF document text
- https://akilanews.com/ckfinder/userfiles/files/32195616841.pdfIn PDF document text
- https://stl-log.com/htdocs/cljr/data/files/jevazu.pdfIn PDF document text
- https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614faba95ab6c---kotegabuvegiforaf.pdfIn PDF document text
- https://iphonerepairservice.nl/app/webroot/files/userfiles/files/gupajedufumixivefefuzipu.pdfIn PDF document text
- http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbe4a0c62f---71232297001.pdfIn PDF document text
- https://drgcode.managenet.ro/images/file/fulazuwokedejuserojik.pdfIn PDF document text
- http://irvine.songhakbbq.com/uploads/files/23932235932.pdfIn PDF document text
- http://speed-r.com/js/upload/files/litalinojoxigadazinel.pdfIn PDF document text
- https://defi128.phpascal.com/userfiles/files/pipidosiwoferosigutiv.pdfIn PDF document text
- http://cyclad.org/UserFiles/file/remikudefu.pdfIn PDF document text
- https://cissud.com/uploads/ck_editor/files/43834077443.pdfIn PDF document text
- http://dzbnf.com/upload/file///nedotuzarajuxuxoma.pdfIn PDF document text
- http://sincaremedicaltour.com/js/upload/70405880113.pdfIn PDF document text
- https://lawtutors.co.uk/js/ckfinder/userfiles/files/96882491640.pdfIn PDF document text
- https://bleikss.com/userfiles/file/juvigufuk.pdfIn PDF document text
- http://zjgjqmr.com/v15/Upload/file/202199648371011.pdfIn PDF document text
- http://naoshima-tours.com/images/blog/file/zufikev.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=free+fire+apk+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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000b23a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB23A	14860 bytes
SHA-256: `344dcbb21ddbc6208b1badc653838ee1a4d922e36291ccc035be1b47706f76b5`
`font_01_sfnt_off0000d7e1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD7E1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000eff7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFF7	9884 bytes
SHA-256: `4746fc4051f4732a6492de7c9976b7406643f24141c30d0fd46e3ff5d24e04fe`

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