PDF malware analysis — malicious · 140955d008209927

MALICIOUS

PDF

83.6 KB Created: 2021-09-18 06:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: dace3e350d50220538e989f5486924f1 SHA-1: cb7ee935ccdd00c80cb557211e5784b9d7b9caca SHA-256: 140955d008209927780ef03b513ff2562655c65f9d5a514bc1b561591c2f340f

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded JavaScript stream and numerous external URIs, suggesting it is designed to redirect users to malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF acts as a link farm on disposable hosting.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 6

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.
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://archism.ru/uplcv?utm_term=tricep+muscle+diagram PDF link annotation
- http://volvo-cars.jp/js/upload/files/takikivumodomoli.pdfIn PDF document text
- http://palyavalaszto.hu/teszt/upload/file/geponosafonepob.pdfIn PDF document text
- http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/82559815544.pdfIn PDF document text
- http://18554080.com/userfiles/file/biwozodiz.pdfIn PDF document text
- https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136f2b94cdf5---tanitofelinug.pdfIn PDF document text
- https://sofupingame.com/calisma2/files/uploads/nibajelexupu.pdfIn PDF document text
- https://renhedc.com/uploads/files/202109131426192428.pdfIn PDF document text
- http://aaz.sk/editor_uploads/files/56846176140.pdfIn PDF document text
- https://mobiligennari.com/userfiles/file/11622881475.pdfIn PDF document text
- http://sarkar.ie/userfiles/file/6676050973.pdfIn PDF document text
- https://cecprint.com/images/file/30986763202.pdfIn PDF document text
- https://doan295doson.vn/namthuan/images/news/files/wekerejaxalijisepiv.pdfIn PDF document text
- http://gyogytornasz.hu/editor_up/29920801597.pdfIn PDF document text
- http://metalzilembo.it/userfiles/files/takepejozuxe.pdfIn PDF document text
- http://biosurfest.com/userfiles/files/13039020861.pdfIn PDF document text
- http://www.prodomasa.com/ckfinder/userfiles/files/punugake.pdfIn PDF document text
- https://flour.co.uk/ckfinder/userfiles/files/46060020956.pdfIn PDF document text
- http://sakuragiramenandsushi.com/uploads/files/40186921107.pdfIn PDF document text
- http://ventss.ru/userfiles/files/sorekixine.pdfIn PDF document text
- http://www.nena-artspace.com/ckfinder/userfiles/files/7660974790.pdfIn PDF document text
- http://explosivedevices.ru/media/file/newetepejuluwawuboluku.pdfIn PDF document text
- https://gilbertems.com/videos/file/rolutedeletuzagut.pdfIn PDF document text
- http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16131d86ab8ca0---zapubazegixubusum.pdfIn PDF document text
- http://atthaya.com/file_media/file_image/file/sipaporefinik.pdfIn PDF document text
- http://studio-orlandini.com/userfiles/files/91857914843.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_off0000e109.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE109	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f91b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF91B	18204 bytes
SHA-256: `31c2441f239080efe799a1fd7d50e8a374d4b3f3ab4823f54e2cd3cbda06e968`
`font_02_sfnt_off00012861.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12861	10596 bytes
SHA-256: `3be7381dd2628c09a33912a903635a20b6b9126c4bb9ff44ed2bcdc4897bb86c`

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