Malicious PDF — malware analysis report

Static analysis result for SHA-256 5710c977b0f59521…

MALICIOUS

PDF

83.0 KB Created: 2021-09-19 06:35:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 07df9c0fa76df9fa3bd311cf92d3bbc8 SHA-1: 15dd9656aa66af6beb705cbab3b658ece1c0f6c7 SHA-256: 5710c977b0f5952164bb005ef5b497ec247d848aaa2e46d316decdf6291abfd3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution attempt. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a tactic to obscure the true malicious destination. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://riverhouse.at/pcms/content/file/lopokevibikisexomox.pdf In PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/64841098406.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/sogeremaf.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/boruf.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/36035570659.pdfIn PDF document text
    • https://petribax.com/userfiles/file/33291143296.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/kovitobilivutofuxejuris.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/nakotegevisusixu.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/wosezeron.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/kezekeserivibisoxebulixa.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/45837935053.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/jetopej.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/26849432961.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136922248042---tavazidanos.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/rowomemunewogedu.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/dafigepipurovu.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/56338267972.pdfIn PDF document text
    • http://hitechdentalhouston.com/uploads/files/fopesokomumusi.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/34990970497.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/99995449528.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/15204200608.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/wujofanutesekazasi.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/30469073856.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/zuxujasajujuwalosak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=install+cinema+hd+on+ipadPDF 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_off0000de1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1C 18684 bytes
SHA-256: 0d14a74ef2a15d0bf49e5059b43731d65b675c31dc894232951b0a4a0aad68ff
font_01_sfnt_off00010ea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA3 10632 bytes
SHA-256: a58d043ae167888d68eb8d07d8699476c8eaa831326b974064a8373a1d70b19c
font_02_sfnt_off000126bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1