PDF malware analysis — malicious · 2fdf0df1bb8cb744

MALICIOUS

PDF

81.9 KB Created: 2021-09-19 00:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 1231ba62f953ee3753a9f4a811bb2d85 SHA-1: 4c9768aabb6c4897d02c9e5e39201d8bb7c26420 SHA-256: 2fdf0df1bb8cb744f0adf9a3085bd68be07c0e41256e92672d5d8ba882074ccc

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the use of embedded JavaScript for malicious redirection or exploitation.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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://crewmak.ru/uplcv?utm_term=android+start+web+browser+intent PDF link annotation
- http://ogcdc.org/uploads/ck_upload/files/69834549004.pdfIn PDF document text
- http://sissonne.hu/editor_up/tuwetibigoz.pdfIn PDF document text
- https://affordans.com/ckfinder/userfiles/files/jolaxekedose.pdfIn PDF document text
- https://diamond-marketing.cz/soubory/94759534199.pdfIn PDF document text
- https://campfun.myhost888.com/upload/ckeditor/files/76251051911.pdfIn PDF document text
- http://ybshajiang.com/userfiles/file/2021-09-03/210903135600557736do3pgnczwkjx.pdfIn PDF document text
- https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144bfae55e28---joverabo.pdfIn PDF document text
- http://aylincinarli.com/fckfiles/file/72419679447.pdfIn PDF document text
- http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614653575feed---nenapafanutajuginusajam.pdfIn PDF document text
- http://allycatering.com/userfiles/borifisijanu.pdfIn PDF document text
- http://vdi.vn/userfiles/file/kajobo.pdfIn PDF document text
- http://teplolux72.ru/upload/file/9916146326.pdfIn PDF document text
- http://cserepakciok.hu/xdata/file/33179926826.pdfIn PDF document text
- https://n-tlg.com/files/file/movizenipefanofenid.pdfIn PDF document text
- http://skncn.com/u/files/85654699384.pdfIn PDF document text
- http://4darchitecture.org/img/all/nalijase.pdfIn PDF document text
- http://airelimpio.mx/img/editor/file/galamekuvi.pdfIn PDF document text
- http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/25938945688.pdfIn PDF document text
- http://anticacarsulaeborzoi.eu/userfiles/files/tojeb.pdfIn PDF document text
- http://haiphongcontest.com/images/files/ginawevidiwanokexa.pdfIn PDF document text
- http://idrogastermoclima.it/Utentifile/FCKPage/file/38734302794.pdfIn PDF document text
- https://cafemocion.com/userfiles/file/najivekijinupibex.pdfIn PDF document text
- http://youngshiny.com/userfiles/file/1631807453.pdfIn PDF document text
- https://forexinc.ca/upload/editor/file/90965640123.pdfIn PDF document text
- http://noithatlekhanh.com/Images_upload/files/jeponidesokivabaforu.pdfIn PDF document text
- http://atsrealtyvietnam.com/upload/files/55121597027.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_off0000d517.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD517	20628 bytes
SHA-256: `d8bc098508d32c180e3c42c6e704bbacf3ff640bef1e8b7a5d2562b2516d4188`
`font_01_sfnt_off00010a37.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A37	10404 bytes
SHA-256: `e7ed0fcf7c4c947ed5318d763cc5887b628aa18e4f5f07365f296bf882c43e26`
`font_02_sfnt_off000121fb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x121FB	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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