PDF malware analysis — malicious · 2d99ddae346b818e

MALICIOUS

PDF

80.6 KB Created: 2021-09-15 15:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 3a985aa3039c0a6d637b5a3a8b9ce633 SHA-1: a5734730409ffc88cf13c403c3ce86b590c03c9f SHA-256: 2d99ddae346b818ece675d9e09aaacfd4eaac5120057c15575bb06da0bad5b64

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it is used to redirect users to phishing or malicious websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm on disposable hosting.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

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://hotelexpert.ro/uploads/files/kegesuzopagoju.pdf In PDF document text
- https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c2d0691ed---32705513557.pdfIn PDF document text
- http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1613dab0b17253---dokodi.pdfIn PDF document text
- https://granitabrasive.ro/editor_up/57911356293.pdfIn PDF document text
- http://numere-mopede.ro/mm/file/leror.pdfIn PDF document text
- http://topimmigrationlawyer.org/ckfinder/userfiles/files/dabepozijegakudukidol.pdfIn PDF document text
- http://quocteanviet.com/img-chamthi/files/92889877494.pdfIn PDF document text
- http://mytrangroup.com/uploads/userfiles/file/mexafuvumepugekojokop.pdfIn PDF document text
- http://abwalabamaave.com/uploads/files/nifelemakaseruto.pdfIn PDF document text
- http://all-vehicle.net/js/upload/files/zaxatexijo.pdfIn PDF document text
- http://ketphatthinh.vn/upload/files/52624011828.pdfIn PDF document text
- http://evpltravel.com/xv_image/file/tigavijenamoxeritaw.pdfIn PDF document text
- http://aquatherm-graz.at/files/98342491470.pdfIn PDF document text
- https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/161301830cb254---91910085945.pdfIn PDF document text
- https://sabagdasarov.ru/upload/file/89571001675.pdfIn PDF document text
- https://zivotzaokny.eu/res/file/56443261466.pdfIn PDF document text
- https://invision.buzyhub.com/files/25598978905.pdfIn PDF document text
- http://fuerst-architects.com/uploads/file/fasutapener.pdfIn PDF document text
- http://ewhamd.net/upFiles/ckeditor/files/lugomabenat.pdfIn PDF document text
- http://gz-theoutfit.com/UploadFiles/FCKeditor/20210906075834.pdfIn PDF document text
- http://koddous.com/userfiles/file/fopuwaninuxatesosunar.pdfIn PDF document text
- http://vntattoosupply.net/uploads/image/files/65883359804.pdfIn PDF document text
- http://skupka23.ru/upload/m/64433411187.pdfIn PDF document text
- https://mrdak.cc/uploadfile/files/20260992144.pdfIn PDF document text
- https://cqc-material.com/app/webroot/userfiles/files/15323029418.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+move+sd+card+to+internal+storagePDF link annotation
- 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_off0000d63b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD63B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ee4d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE4D	17476 bytes
SHA-256: `b2ddbbca0ee48910aaa983a23eb7df952de5389fb0e1fe15ae634cc5e9ccc1ac`
`font_02_sfnt_off00011b98.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B98	10856 bytes
SHA-256: `ba8faedcfb4c69f4940d01e33faf3ba8321bc1e86aa07b9411f5902df64a8a3f`

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