Malicious PDF — malware analysis report

Static analysis result for SHA-256 9270b75f3e51e02a…

MALICIOUS

PDF

72.9 KB Created: 2021-10-08 02:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 31eee3e965fb3fefc9db4d7081826a62 SHA-1: ad164e5882a34b1b5db74b55f6a9f7fa7dc7e960 SHA-256: 9270b75f3e51e02a1568332a40f474083ea8a6a9afe9a512ea138125ef6a73f1
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF acts as a link farm, directing users to numerous external URLs hosted on disposable domains, a common tactic for phishing or distributing further malware. No scripts were extracted, but the structure and URL distribution strongly suggest a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://garglob.ru/uplcv?utm_term=complex+variables+and+partial+differential+equations+book+pdf PDF link annotation
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/perodovuzinup.pdfIn PDF document text
    • http://bacviettech.vn/userfiles/file/21897108860.pdfIn PDF document text
    • https://ttablaksystem.hu/files/file/12102112655.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/47535967215.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/87581405569.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/63661708269.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/toxatezoxidoxofonaxusari.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021100623190773499.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/xawixaruwuvip.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/56158061294.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/84505590360.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/tepenakapobeze.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/wofinugalugaz.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/bifonedisafiruluxovezoxop.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/tulodupokak.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/worowotapujikabetasusig.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/cf2bc0389d31160645034cafab664e87/fixaniga.pdfIn PDF document text
    • http://edeins.com/userfiles/file/465203866.pdfIn PDF document text
    • http://fsanaq.com/upload/file/21092220510035712759exbgjbwg4i.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/68109693573.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/35037194695.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/jorejaje.pdfIn PDF document text
    • 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_off0000b657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB657 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE69 17748 bytes
SHA-256: a8035599375e96e18bf887b1d09d7c421ee54fbac6b636d223b416ef9bf5c71e
font_02_sfnt_off0000fba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA1 11336 bytes
SHA-256: 5f2535a6422ce119df63205ff8f44d2d1ce6273278b5f3542f491d82112e97c6

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