PDF malware analysis — malicious · 628f39b5b0cd0e13

MALICIOUS

PDF

84.3 KB Created: 2021-09-20 00:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: e04d32a94afb6706fc8ba2da534fa2d3 SHA-1: fbcca80a93c199449d1c75407d7b0c7b91305c83 SHA-256: 628f39b5b0cd0e13b600aa42deb5f0b1de19d55eee7873a0aa5f1e3715de77e1

146 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and exhibits characteristics of a link farm, with numerous embedded URLs pointing to potentially malicious sites. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to phishing or malware hosting sites, aligning with spearphishing attachment tactics.

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.
QR-code redirect lure medium SE_QR_LURE

Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
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://queure.ru/uplcv?utm_term=update+poco+f1 PDF link annotation
- http://signexpowholesale.com/project-new/christianbook/upload_images/file/6611160133.pdfIn PDF document text
- https://lean-ds.com/upload/editor/file/35977859606.pdfIn PDF document text
- https://tradingphrases.net/userfiles/files/sofibi.pdfIn PDF document text
- http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161467b6cbf277---57083399644.pdfIn PDF document text
- http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/wawesites.pdfIn PDF document text
- https://univerosg.com/ckfinder/userfiles/files/88181901634.pdfIn PDF document text
- http://epmresearch.org/userfiles/files/xinizowugaravikajosoweri.pdfIn PDF document text
- https://indobaliart.com/sitefiles/file/lukakewijapejonab.pdfIn PDF document text
- http://apsencollege.org/test/fckeditor/file/jazubiz.pdfIn PDF document text
- http://hockeydh.com/files/ups/files/73674239989.pdfIn PDF document text
- http://kargo-box.com/uploads/files/8581399643.pdfIn PDF document text
- http://abbeloosschinkels.be/userfiles/file/waxaxabamanibufogiropo.pdfIn PDF document text
- https://aluminiosarla.com/userfiles_arla/files/pomagetubufira.pdfIn PDF document text
- http://fujiya-la.com/uploads/files/wigavulumedoj.pdfIn PDF document text
- https://dpt-mh.com/uploads/news/files/kiteboxulojupaba.pdfIn PDF document text
- http://bn-biz.com/userData/board/file/17285492780.pdfIn PDF document text
- http://xn--3e0b556bhrbowi6undva.com/ckupload/files/83296680457.pdfIn PDF document text
- https://www.terraton.com.my/ckfinder/userfiles/files/wopukoderasudera.pdfIn PDF document text
- https://xtrafitcoaching.com/www/images/files/rogupatok.pdfIn PDF document text
- https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16140cf1726e09---63756880253.pdfIn PDF document text
- http://kartinatv.org/uploads/files/15681699551.pdfIn PDF document text
- http://tsg-edinstvo.ru/userfiles/file/womigixenugumazuwitu.pdfIn PDF document text
- https://irrisyst.eu/files/file/wuwesosetojilig.pdfIn PDF document text
- http://de.ruben.pl/ckfinder/userfiles/files/jigomegurogesavomevameran.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_off0000e5a4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE5A4	18224 bytes
SHA-256: `ab8b0d8cf52350aa844c7c726fb5e202fb2b4b80b8d2485bdfacb2e75e33d8a1`
`font_01_sfnt_off00011485.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11485	10164 bytes
SHA-256: `0b3e4af30212af83de10aaeec1faa1d4e207f06f6cf6ee9689433c7da9a4df4e`
`font_02_sfnt_off00012b71.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12B71	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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