Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ac048e4c61b40ff…

MALICIOUS

PDF

80.3 KB Created: 2021-09-11 17:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f020579c91c952ac8b933063b40717ad SHA-1: 5d29229e5d97656ed5b0dd931bc475fca7be00e5 SHA-256: 2ac048e4c61b40ffb97a9dff7b6ec1dd440611f532995b509a5847361ec36af6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The presence of embedded JavaScript and a large number of external links, many pointing to potentially disposable domains, indicates an attempt to redirect users to malicious sites. The primary intent appears to be phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://zhodnoceni-penez.cz/is/images/FCKeditor/File/99071107262.pdf In PDF document text
    • https://aawyx.com/sites/default/imageuser/file/73742182573.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/58169334607.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/rozuxopenosapa.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/18953882922.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/10824950930.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/pozika.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///19491945715.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109030110451050.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/rutagemuwilefifulexuwozo.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/melalase.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/82113667196.pdfIn PDF document text
    • http://langyupharm.com/upload/files/56303336358.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/73018249094.pdfIn PDF document text
    • http://baozhaopharma.com/upload/files/83076737805.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/86421604695.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/4cb4fbc9e8a4ec4919da80abe560eb61/rowonedizisezefexuwanawet.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///luxiri.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/50900000432.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/xudogesakofusabufoxumap.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/73858051942.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/rufurak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=video+picsart+downloadPDF 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_off0000d489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD489 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9B 18000 bytes
SHA-256: db78394d932483969f23c98b8e06a8a48befb2511a455aa187af7f47178115b8
font_02_sfnt_off00011b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B73 10564 bytes
SHA-256: 0bb3cea3c2bdafcd75cf06c52666d6881b86607db435e5704e8be90d818d78d0

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