Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa0961d82247c0ee…

MALICIOUS

PDF

81.2 KB Created: 2021-09-23 01:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 03e557cb7899ed0418b9242a88544f7d SHA-1: 6bf85f412d5a28bf4704dcd6c1723b47ec44084f SHA-256: fa0961d82247c0ee27db8c9ae058cc5dbca27d94699486bee34be3cd0b77819d
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to disposable domains, suggests an attempt to host or redirect to malicious content. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating the PDF is structured to act as a link farm, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • 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 http://obchodsezlatem.cz/upload/files/23113777448.pdf In PDF document text
    • https://susta.vn/userfiles/file/61542855028.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/lidodixinov.pdfIn PDF document text
    • https://bachson.net/upload/file/4084825691.pdfIn PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/lamalap.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/16887652045.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/libevusegewiminivezaxawi.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/bogobisuwiluzaka.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/livosisekemu.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/koref.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/15254777252.pdfIn PDF document text
    • http://panova-art.com/files/file/modes.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/posajapuzi.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/75008998453.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/rididazifesegokomidij.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/vunima.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/farosikepil.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/xubosurapejiwuj.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/zuvazozizufemigit.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/2dr6dadq7jagagtf8otscsb1ro/dafowobofusatux.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/dujuwufufaparuvekoxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=biriyani+telugu+movie+download+tamilrockersPDF 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_off0000d7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CC 11224 bytes
SHA-256: 5b55a3607d23a686fdddc65d800bdae0515c0c85be8095b7649a9dc05f0c6491
font_01_sfnt_off0000f1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FA 17600 bytes
SHA-256: 185e62e05d244f99630cfcdaae7275e00788d5cd0c9ffe5d6ac44235e6802f31
font_02_sfnt_off00011f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1