Malicious PDF — malware analysis report

Static analysis result for SHA-256 81bf8f32103d5541…

MALICIOUS

PDF

76.2 KB Created: 2021-09-21 05:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 780572f44874c22aaf61404db2c3597f SHA-1: 46db51ce0f8e1c768c341ef1d3b22d971d1865d6 SHA-256: 81bf8f32103d55418a13fe9b257b32fee9a38bb6f7c7e01035990af7bf99c897
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to potentially malicious domains, and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggests it's part of a link farm designed to redirect users. The presence of external URIs and the link farm behavior strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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://maritime-models.com/userfiles/file/nidonilafujagopez.pdf In PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/77230835582.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/watokadufebip.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/63026295508.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/vipizofowujot.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/1522583469.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/vitoxugun.pdfIn PDF document text
    • http://alvitraders.com/files/sozuku.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/48883848486.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/41922965531.pdfIn PDF document text
    • https://emenu.hu/editor_up/lilosexukela.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/sifajofigimizeberem.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/78250939431.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sejorapexopu.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/74928076058.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/gofipotulotomezajefe.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f32c0c5513---34957489828.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/11158603334.pdfIn PDF document text
    • https://plasy.com/uploads/file/30498976172.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/92654075464.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210904151241.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/12521724316.pdfIn PDF document text
    • http://jtipartner.com/ckfinder/userfiles/files/44415683706.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/24986787211.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=greenberg+advanced+engineering+mathematics+pdfPDF 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_off0000c4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC4 17128 bytes
SHA-256: 02c68744a251ae357aaa41e25ac4ac03c23f6047601dfd6e2b9eca438eceabe7
font_02_sfnt_off00010941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10941 11144 bytes
SHA-256: b8f680d9a068a4a111212199ff706cbcea3d1640d387cc7aec085256d50728df

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