Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1dba233b01aa95c…

MALICIOUS

PDF

71.5 KB Created: 2021-09-21 13:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 90432c6ce1202f4017cf1a5186d3296b SHA-1: 41521750d7b9988d1bf830fd00a5dac0e43199bf SHA-256: e1dba233b01aa95cf80cfcc0b6d2015aff37b46e5a7d69d01bef8ca7e57eb54e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code. The presence of numerous external URIs, many pointing to PDF files on different domains, indicates a link farm likely used for SEO poisoning or distributing further malicious content. ClamAV and ML classifiers also flagged this file as malicious, supporting the assessment of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://dj-venci.com/uploads/pages/files/zexojoxopa.pdf In PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb38dba90c---disezudimevenosozowu.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/92865012488.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/25659041972.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/mumosowajaxes.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/bajidis.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-18/20210918075849928486.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/nurewu.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gosogoba.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/sugekekedavipumutufo.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/31210366774.pdfIn PDF document text
    • http://k1a.ru/images/files/file/66088331483.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/mavogom.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xiwezuvavadowax.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/35034039093.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/wemiwodejewibexi.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/2167527758.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/fofiz.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/be4a990ec9c1844d4c911446505f3a03/4918191615.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/loxubixuzubediwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=break+the+silence+the+movie+fullPDF 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.

FilenameKindSourceSize
font_00_sfnt_off0000b623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB623 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3A 10912 bytes
SHA-256: 27a3811332f700f916caae00d22b7f313357f25abbe0585bbb38e8ad060ae2ed
font_02_sfnt_off0000e75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75C 16320 bytes
SHA-256: 6ab6f0bf4850ef60fb74d5b8a17f195e80be2333e2ce5c59de924b929c9d9764

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