Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa002db3c121fc6b…

MALICIOUS

PDF

75.6 KB Created: 2021-09-23 06:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 29ae43c96173149acfacb8d843c4320b SHA-1: 9bed959eccf491591cc6f4a6b9b5d7ed6962ba79 SHA-256: aa002db3c121fc6b85a82b3511c76bb1d662d8892b9ca936ea0a5e4f1e99a346
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The presence of a link farm with numerous disposable URLs suggests an attempt to obscure the final destination and evade detection, likely serving as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ombs.ru/uploads/files/75098462695.pdf In PDF document text
    • http://uniquecharacters.com/upload/files/46941193882.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/58260110538.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/29902717955.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/77197736844.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/kajotikeg.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/29050592159.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/dodunirewudewox.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/roxumek.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/zonuvojubenexo.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/94929098222.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144989283e39---30524057964.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/zepabexa.pdfIn PDF document text
    • https://asken.as/bilder/file/7519948258.pdfIn PDF document text
    • https://schmitz.cz/res/file/jodufa.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/77324272983.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/50650337477.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/37149423069.pdfIn PDF document text
    • http://fnathservices.com/upload/file/wazorewopebodoladutele.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/46741839934.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130dc81ea15a---ziletagokon.pdfIn PDF document text
    • http://nguoiquangphianam.com/uploads/files/romolepuw.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/183c37fc0970ff8a1f350a93026e0f99.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=square+root+curvePDF 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_off0000c658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC658 16848 bytes
SHA-256: 43b85c1a8edf93a3c3a101578586e6cc82db99abdaf2af6d83b6987f63c6634f
font_01_sfnt_off0000f1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E4 10200 bytes
SHA-256: 478d0b334ab687fa3b66e6aa467b66b4de8b428f9f2bcce17f5e6bb7769643ab
font_02_sfnt_off000108f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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