Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf3e442ef6c3ea13…

MALICIOUS

PDF

132.1 KB Created: 2021-03-28 19:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 134c74e26a9d8ee267aa379a16fed6f1 SHA-1: d126fa50958f573f9c82292b73441fdb76850808 SHA-256: bf3e442ef6c3ea1340b5b099403a447e34f9cc5945b364c25072478411fdd65a
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many of which are structured as SEO-friendly PDF downloads, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_LINK_FARM' and the presence of multiple unknown reputation URLs strongly indicate a malicious intent to redirect users to potentially harmful content. The ML classifier and ClamAV detection further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mezovuduw.ru/wix?keyword=policy+and+procedure+manual+church+sample
    • http://zutatowatipo.mywebcommunity.org/ubqari_magazine_may_2020_free_download.pdf
    • http://biwumani.mywebcommunity.org/cambio_climatico_en_mexico.pdf
    • https://cdn.sqhk.co/tejikeluz/e0ojagj/descargar_minecraft_version_2009.pdf
    • http://vijexibat.mywebcommunity.org/classical_guitar_tabs_free.pdf
    • https://wifovusu.weebly.com/uploads/1/3/4/3/134312249/78becf8d0d805.pdf
    • http://kavelokafozi.medianewsonline.com/auxiliar_administrativo_del_estado_temario.pdf
    • https://cdn.sqhk.co/nenuguvan/jgD5nzn/bossy_ball_4.pdf
    • http://sabovibin.medianewsonline.com/where_is_midwest_boots_located.pdf
    • https://cdn.sqhk.co/fedelubu/jgchajb/rush_hour_3_cast_yu.pdf
    • https://cdn.sqhk.co/pimidima/jfjdjdj/overkill_3_game_download_uptodown.pdf
    • http://xuzobinemipivor.mygamesonline.org/what_is_a_rain_crow.pdf
    • http://foxiduwanati.mygamesonline.org/wikewimitufewib.pdf
    • https://sezivokup.weebly.com/uploads/1/3/5/3/135318733/1cac373f5.pdf
    • http://jilavixit.medianewsonline.com/37309962368.pdf
    • https://cdn.sqhk.co/burajugi/igphghe/abc_matching_worksheets_printable.pdf
    • http://tupaxeguna.scienceontheweb.net/sindrome_de_apnea_obstructiva_del_sueo.pdf
    • https://batapasupo.weebly.com/uploads/1/3/1/4/131482803/wubuvupe_juxap.pdf
    • https://rudazolabogufaj.weebly.com/uploads/1/3/4/7/134772206/707258.pdf
    • https://cdn.sqhk.co/xawodoze/br592hf/draw_lines_in_excel_vba.pdf
    • https://cdn.sqhk.co/mebosuxular/R9gcidY/gekorezutojevineson.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.thdl.org/http://www.thdl.org/Tibetan
    • http://gomugugagaf.onlinewebshop.net/77513655059.pdf
    • http://sabiwilurase.atwebpages.com/bioshock_rapture_libro_espaol.pdf
    • http://sinusudixuxuwad.atwebpages.com/zepupezanirafimap.pdf
    • http://moxadokikubod.onlinewebshop.net/jodixav.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.htmlTibetan

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ada2.bin
7d8f056d14ca9119d4a740f59ca2b33b83952ccd33aba73d780f722748ef9461		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1ADA2 1656 bytes
font_01_sfnt_off0001b5e3.bin
ec5d8db712bef933e82f5bec0ad7ac98b59d6b9b6ea65585eae7e66ff3ba17aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B5E3 5416 bytes
font_02_sfnt_off0001c831.bin
7e98081f44ff9be21f2be21d17426fa35b07cfbadd26ac3f6cbb691f5ce60abc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C831 8976 bytes
font_03_sfnt_off0001d9f5.bin
d593f1f30ffc1bbeacf07d5667e0fcbe7269782307617169527176218deccd20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D9F5 11720 bytes

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