Malicious PDF — malware analysis report

Static analysis result for SHA-256 90762658ba0173fc…

MALICIOUS

PDF

79.2 KB Created: 2021-09-19 09:38:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b9a6bd1aa1fc7c34d751a7e72e73c87a SHA-1: 8d9e65c3842bf33fc4f9fe1a245e203d7b6beca4 SHA-256: 90762658ba0173fc0803374c15698e7c386ed0bc0ad3825e949e4dc60a3385fb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs pointing to various domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are characteristic of phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://chcial.ru/uplcv?utm_term=pris+stratton+blade+runner PDF link annotation
    • https://concurs-euclid.ro/upload/fck/semulawazu.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/kobejifojeb.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/letulokemelujerabuna.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/a0k09ujb7mh1p2a2kg68ga3643/korolowuzominuze.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/10887583719.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/68381281755.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/sedamumil.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/renodinoxugigolow.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/65226367916.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/vuvowituzidutetubeloxow.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/29630588668.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/95202752193.pdfIn PDF document text
    • http://lifeisartfoundation.org/sites/default/files/images/userfiles/file/zifarejapar.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/bupelufojonexebezezevip.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339e9083a66---tirixuvixonozexozu.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/86320002436.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/minazubegokemigobixusuti.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/78553319080.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/semukugar.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/zuwedupibofes.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/gizapedotux.pdfIn PDF document text
    • https://koratspring.com/upload/file/39082845444.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/nuzusemutufeso.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/26106927408.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/budejugodozefotixokim.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_off0000cd74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE586 18768 bytes
SHA-256: bc3326c65eb7d24c59044d9fb167423c7295186f6e93a79bfee9c8527520417d
font_02_sfnt_off00011638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11638 10480 bytes
SHA-256: bb2d92b516bde36ce855389128c7bb33a3acb65d913f77ca4c632d04376ec2a1