PDF malware analysis — malicious · 6a72bd483e443f9e

MALICIOUS

PDF

81.7 KB Created: 2021-09-09 16:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 484170dfb409e1eb30b93bc7c1d078ab SHA-1: 6374ae1fadf53ca5cfca78df0fd2e08f1db92c9a SHA-256: 6a72bd483e443f9e4cc968bd4f5173b2c1eef97b124bc1104fe1570d1b734194

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The document contains numerous embedded URLs, many pointing to PDF files on various domains, suggesting a link farm or content distribution network. One notable URL, http://wernitznigg.at/files/13522645538.pdf, is part of a heuristic indicating a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely related to phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9985

Heuristics 5

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://wernitznigg.at/files/13522645538.pdf In PDF document text
- http://yuhenganquan.com/userfiles/file/20210902092016_1204764231.pdfIn PDF document text
- http://solyaris.pro/admin/ckfinder/userfiles/files/gaxopanupomokexoli.pdfIn PDF document text
- http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0c630bd5c---95343657726.pdfIn PDF document text
- https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613312c65da8b---pojufediwul.pdfIn PDF document text
- https://parvazyab.com/basefile/api203/files/88790077048.pdfIn PDF document text
- https://negaratoto.com/contents/files/79312035731.pdfIn PDF document text
- http://aerotechgroup.ru/img/outer/files/19922227800.pdfIn PDF document text
- https://yocarbroker.com/upload/ckfinder/files/kuzimebebemasejafipodenij.pdfIn PDF document text
- https://tranhtreo.com/images/ckeditor/files/kozupilaxinamebedux.pdfIn PDF document text
- http://faisaltowel.com/survey/userfiles/files/nofemuligimapidororim.pdfIn PDF document text
- https://toananhmedical.com/uploads/files/35980347536.pdfIn PDF document text
- http://hyundaidongdo3s.com/images/files/24906443159.pdfIn PDF document text
- http://www.prakashirrigation.com/uploads/fck/files/zilajowarajifime.pdfIn PDF document text
- http://symbioticlifetech.org/attfile/fckimg/file///20210909145159_148584115.pdfIn PDF document text
- https://tarsiman.ee/files/file/736725339.pdfIn PDF document text
- http://www.bc-arman.kz/ckfinder/userfiles/files/bupifesiwagufo.pdfIn PDF document text
- http://nessie-vinylcare.com/file/limojud.pdfIn PDF document text
- https://vietnaminsight.biz/ckfinder/userfiles/files/78190072595.pdfIn PDF document text
- https://kclandscapes.com/ckfinder/triplebuserfiles/file/nolutafijavifasozawu.pdfIn PDF document text
- http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/duguzoxalamadapuviko.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=pokemon+let%27s+go+modsPDF 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_off0000d9ea.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD9EA	10364 bytes
SHA-256: `56d40871287b5a2bf0845adfa76c10bec58d1dc5fe6a4949dd2e1469370811db`
`font_01_sfnt_off0000f134.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF134	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010946.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10946	18764 bytes
SHA-256: `3e54ee2ea79dcc7e88efe5b3b5a65665283aec8d404bf8605ce955f9692973c4`

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