PDF malware analysis — malicious · 8af5c1dac1330501

MALICIOUS

PDF

82.9 KB Created: 2021-09-20 02:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 9e64fd0038b5b3d24b5df7f671679339 SHA-1: 0520eb1b2d40e2926b8051ee6cdcf371f1a85341 SHA-256: 8af5c1dac1330501e1fd2e4ac7a61e1f9da9561720e1bbe3ced0ba548c0d9357

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. The presence of numerous external URIs, many pointing to disposable hosting and forming a link farm, suggests a mechanism for redirecting users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior, likely intended to serve a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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=endless+frontier+tower+of+trial PDF link annotation
- http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16130d16fd6120---bajemilixepijumi.pdfIn PDF document text
- http://findacommodity.com/upload/file/38625622935.pdfIn PDF document text
- http://jjmcp.jp/userfiles/Image/file/nixunikaxeg.pdfIn PDF document text
- http://vasekurzy.cz/userfiles/file/karawetawixafanojivas.pdfIn PDF document text
- http://www.petersonassoc.com/emailimages/file/wexonixubotubex.pdfIn PDF document text
- https://fainitelecommunication.com/public/editorfiles/file/rixigokude.pdfIn PDF document text
- https://angel-juicer.com/FileData/ckfinder/files/20210904_9A4174EA83E5737D.pdfIn PDF document text
- http://hdg-gmuend.de/userfiles/files/7314828400.pdfIn PDF document text
- http://platypusspot.org/uploads/ckfinder/userfiles/files/sugofevuwuvixonuzenikofi.pdfIn PDF document text
- http://msslink.ru/userfiles/files/4801801751.pdfIn PDF document text
- https://holcom-solar.com/webroot/img/files/78394689218.pdfIn PDF document text
- http://redondoclassicburger.com/uploads/files/14446354005.pdfIn PDF document text
- https://giverny-bkk.com/upload/files/vamaluraku.pdfIn PDF document text
- http://hanasushipickup.com/uploads/files/fizisen.pdfIn PDF document text
- https://hijaustabilo.com/contents/files/kugazopekasobodom.pdfIn PDF document text
- http://ichieh.tw/uploads/files/202109040857022753.pdfIn PDF document text
- http://weilandvloeren.nl/fckimages/resapewi.pdfIn PDF document text
- https://tennis-samara.ru/img/file/sijulid.pdfIn PDF document text
- http://aokisuper.com/ckfinder/userfiles/files/34285944437.pdfIn PDF document text
- https://servingltda.com/userfiles/file/xorizetimoxunomamogoziji.pdfIn PDF document text
- https://soportedevida.mx/ckfinder/userfiles/files/jofometizo.pdfIn PDF document text
- http://www.galiantsolutions.com/emailimages/file/filop.pdfIn PDF document text
- http://alteredcompta.com/buddha/ckfinder/userfiles/files/jukafanabovaduxulituven.pdfIn PDF document text
- http://jszl-rolls.com/filespath/files/20210909203604.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_off0000dbe6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDBE6	10416 bytes
SHA-256: `35b0663dcd91903243f69bec517b0bdbcd1e103c0a9f3086db69d5af47ee313f`
`font_01_sfnt_off0000f3a4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF3A4	19268 bytes
SHA-256: `82e58cea60ef72fdd0f5c52e61eb6cc1bfbe97687156f9fc353ad429cf2ad80b`
`font_02_sfnt_off0001261a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1261A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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