Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b287fb2feaab56b…

MALICIOUS

PDF

87.5 KB Created: 2021-09-13 09:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dfcea731f3cdf4d00391033f6904b8a3 SHA-1: 7b9ce5b32fc8a9da0711b8295c640c1cf15fa505 SHA-256: 3b287fb2feaab56bb4e49ca6dcfe6f363b75386a3d4d40d658501e107eef38ce
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to potentially disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded content are consistent with attempts to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://fajanav.com/aym_image/files/bejabop.pdf In PDF document text
    • https://umartravel.com/files/33157293740.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/73833379965.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/1484094464.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/musofoluginuron.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/wonelowomasezazerexu.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/pijoruvaxowarire.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/semuta.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/tapenamavovinolanunov.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/7036404349.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/mirafuvazoka.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/27780029119.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/odrdst2bekhm5ev37do53pni7p/1787175629.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/tazawewujenanejex.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/28633245273.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/gakawadisobixuzowekow.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/227166336.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/73578149167.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/d5f1b33d8eccfaa1e4d78f19b82efba3/mosutalifuduwikujejozot.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/konawemipeki.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/doxezavuzogagulirulebele.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=jumanji+2+the+next+level+full+movie+watch+online+freePDF 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_off0000f1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B0 17596 bytes
SHA-256: 365a464e6e61aa44306803f0d44eb57b5557e3da4133dc3fe9965d4ca6983a1b
font_01_sfnt_off00011ee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FC 11028 bytes
SHA-256: 40d8740db9996aadc03d29e46195c1ac8834e935c6e1923e51d000a3e566b6b8