PDF malware analysis — malicious · ab558f7a56ae2d46

MALICIOUS

PDF

69.2 KB Created: 2021-09-18 18:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 4a928efccf45074a997035ba43a36579 SHA-1: eafa67c9f38af9a4f72f686753a3e0a7a8a2e61f SHA-256: ab558f7a56ae2d4670180fd17c065f18848c75bfffefccfc87d242b0acff3c56

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it's designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JS points to T1059.007, and the nature of the file suggests it was likely delivered as a spearphishing attachment (T1566.001).

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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.
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://cructi.ru/uplcv?utm_term=ant+colony+mod+apk PDF link annotation
- http://www.clc-engineering.com/siteuploads/editorimg/file/josapakefobu.pdfIn PDF document text
- http://contelex.it/userfiles/files/35814084803.pdfIn PDF document text
- http://paolacaone.eu/userfiles/files/pokerim.pdfIn PDF document text
- http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135c2c03abd7---mabobi.pdfIn PDF document text
- http://electriccityusa.com/images/fck_uploads/file/sevonogexujapikonu.pdfIn PDF document text
- http://konditsionery-reutov.ru/upload_picture/file/98194357158.pdfIn PDF document text
- http://jandenzobv.com/image_uploads/file/zutamejukasasure.pdfIn PDF document text
- https://barrier.exma.cl/ckfinder/userfiles/files/dexomexalipamelivexexoma.pdfIn PDF document text
- https://tenekedjieva.com/uploads/file/koxakivafatititadik.pdfIn PDF document text
- http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/79731233025.pdfIn PDF document text
- http://jyjwqj.com/uploadfile/file///2021090200523746.pdfIn PDF document text
- http://smartvoicecom.com/userfiles/gofinupojuki.pdfIn PDF document text
- http://rencontres-icare.org/userfiles/file/62691905082.pdfIn PDF document text
- https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/temidixewenike.pdfIn PDF document text
- https://egokituz.org/files/galeria/files/98130924815.pdfIn PDF document text
- http://telek-trans.hu/editor_up/54103868271.pdfIn PDF document text
- http://bienchidan.org/uploads/files/ludexejedowew.pdfIn PDF document text
- http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409aed117c7---44044894571.pdfIn PDF document text
- http://bipaf.org/2009_home/upload/editor/file/sigibikodapuvojewilepez.pdfIn PDF document text
- http://www.bongbansaigon.com/uploads/files/karugirimojizubapaxa.pdfIn PDF document text
- http://dep14kirov.ru/userfiles/file/43467725386.pdfIn PDF document text
- https://trompis-tondschungel.de/userfiles/file/6982549910.pdfIn PDF document text
- http://hiace-yoshikawa.com/js/upload/files/50711939605.pdfIn PDF document text
- http://greatwalledmond.com/ckfinder/userfiles/files/nejedifobidigaradoku.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_off0000b001.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB001	10372 bytes
SHA-256: `8ac8a02413d103ba175cdc024e31c5b9cfd366efbd47808fa6d62f7b6e2db1f9`
`font_01_sfnt_off0000c781.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC781	16148 bytes
SHA-256: `1076f64fabadec7f03b5508663ed5675592694f3425d56e385d50f0f318de10b`
`font_02_sfnt_off0000ef55.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF55	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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