PDF malware analysis — malicious · ec9580938368e248

MALICIOUS

PDF

69.3 KB Created: 2021-09-27 02:09:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: abeb50269c21829ddbee704ec30efaff SHA-1: 27d658e74deb96cd17bc4c6584cd0ab299ed6c5f SHA-256: ec9580938368e248e3d148db1a55cebfb06634d31c7fb662308de47e7a40e75f

126 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 PDF contains a large number of embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

Nyx PDF Classifier malicious score 0.9965

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 https://laborke.ru/uplcv?utm_term=writing+a+procedure+for+a+presentation PDF link annotation
- http://floral-design-lindgens.de/userfiles/file/tazixekuso.pdfIn PDF document text
- http://halongwave.com/userfiles/file/36224028999.pdfIn PDF document text
- http://aarogyamedico.com/userfiles/file/gonebananozerufeduso.pdfIn PDF document text
- http://alphamarino.kz/images/news/file/5347801523.pdfIn PDF document text
- https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144145149a12---50800742875.pdfIn PDF document text
- https://yar-net.ru/userfiles/file/wizaduruzemarebafatel.pdfIn PDF document text
- https://vadihosting.com/calisma2/files/uploads/80937697974.pdfIn PDF document text
- https://charlesstreetvideo.com/userfiles/file/22966011174.pdfIn PDF document text
- https://ratodua.com/contents/files/13391034290.pdfIn PDF document text
- https://lengthening-sldf.com/userfiles/file/1375886881.pdfIn PDF document text
- https://digbijoynath.in/uploads/userfiles/files/63647022293.pdfIn PDF document text
- https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/tagopofok.pdfIn PDF document text
- http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/ruridak.pdfIn PDF document text
- https://multimetrics.com/ckfinder/userfiles/files/labux.pdfIn PDF document text
- https://ans5680.preneed91.com/upload/files/lexekefigokokulo.pdfIn PDF document text
- http://beverly.kopanramen.com/uploads/files/81855446757.pdfIn PDF document text
- https://aviseco.ro/userfiles/file/xofusajubatorad.pdfIn PDF document text
- http://wingmanresearch.com/userfiles/files/7692276505.pdfIn PDF document text
- https://sacc-la-chaux-de-fonds.ch/fichiers/file/87688234314.pdfIn PDF document text
- http://www.gyndoktors.de/ckfinder/userfiles/files/tezivuwi.pdfIn PDF document text
- http://www.cerel.eu/images/wyswig_images/file/rezipataxuvumigufivisarex.pdfIn PDF document text
- http://cablexconsulting.com/Upload/file/32354018241.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_off0000ada6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xADA6	16320 bytes
SHA-256: `646153c8e30d19ed65f3d39ce949294e0eb3f38aaa6693432851609902fffe82`
`font_01_sfnt_off0000d6f9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD6F9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000ef10.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF10	10840 bytes
SHA-256: `38d1a7695bc1b5e48571fc676a71c8ce68a12be94e008f57436c90e964df52cf`

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