PDF malware analysis — malicious · db20a4811e6aa8e9

MALICIOUS

PDF

72.4 KB Created: 2021-09-21 07:13:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: c953bd07373c9fbf33857b814d16d582 SHA-1: 2419fc73116f96c06e7b96e7233021f7c133ea34 SHA-256: db20a4811e6aa8e9d944e743e8a21342b8dd541d78b16574bb1d13a00a4be4f5

126 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. It contains numerous embedded URLs pointing to external PDF files, indicating a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests these links are part of a scheme to distribute malicious content or phish users. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware delivery attempt.

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 http://lesbambousbleus.fr/ckeditor/upload/files/81749837455.pdf In PDF document text
- https://coastalholidayproperty.com/ckfinder/userfiles/files/9212785939.pdfIn PDF document text
- http://www.rannatennis.ee/data/upfiles/files/61935503493.pdfIn PDF document text
- https://rivieresoceanie.com/userfiles/file/95756979022.pdfIn PDF document text
- http://dreamcatcherltd.com/userfiles/file/zalugasi.pdfIn PDF document text
- http://quartierdete.fr/uploads/fckeditor/file/54356156577.pdfIn PDF document text
- http://zzlhlt.com/userfiles/file/LianMeng202109172316037657.pdfIn PDF document text
- https://dalilak1.com/userfiles/file/rajumajoguzazu.pdfIn PDF document text
- https://mudraconsultancy.com/uploads/files/61874089.pdfIn PDF document text
- http://baohanhranghm.com/upload/img/files/devojiboxudot.pdfIn PDF document text
- http://eia-edu.com/userfiles/file/sabavebakobide.pdfIn PDF document text
- https://klcmekatronik.com/ckfinder/userfiles/files/37386032791.pdfIn PDF document text
- http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a2507dfdd6543647562740dbb7131215/tafexoxu.pdfIn PDF document text
- https://kamhosting.nl/ckfinder/userfiles/files/9988110284.pdfIn PDF document text
- http://francescasciortino.it/userfiles/files/dimuzotibiwizovesijod.pdfIn PDF document text
- http://zamokugrofa.sk/admin/fckeditor/file/83391672985.pdfIn PDF document text
- http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/pufexewupisiwifarojol.pdfIn PDF document text
- https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/0a169a339882ea3790ab732e32f51be3/23450231917.pdfIn PDF document text
- http://trungnguyenjsc.vn/uploads/image/files/11450013242.pdfIn PDF document text
- https://butterfly-propertymanagement.com/userfiles/file/vukovulopatiperugibunasi.pdfIn PDF document text
- http://rjt1.org/upload/files/tuxewejesagovugilawaseju.pdfIn PDF document text
- http://paillasse.hu/userfiles/file/85708275378.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=line+by+line+coding+thematic+analysisPDF 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_off0000b9f6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB9F6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d20d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD20D	10928 bytes
SHA-256: `8724bd1934dee2080aef668f02572cd2549bd70203aee187d1af0ae88ecb10d9`
`font_02_sfnt_off0000eaf5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEAF5	16144 bytes
SHA-256: `a47f2d3f09266324af123c367e263c0aee511c3e9b5a6bea1974fa4c386b7b53`

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