Malicious PDF — malware analysis report

Static analysis result for SHA-256 11e5aa26c182300b…

MALICIOUS

PDF

80.4 KB Created: 2021-09-10 23:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 61d2a867df94eac6981bf2ee1b1ac450 SHA-1: 30869ec758287762bfa5c2c091a356646d290283 SHA-256: 11e5aa26c182300ba306ab58e407569259ac7695122ef5e218c9f3c31f5212cb
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous external URIs pointing to disposable domains, suggesting an attempt to redirect users to potentially malicious content. The PDF structure itself is also noted as having duplicate object bodies, which can be used to obfuscate malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=pdf+reader+for+phone PDF link annotation
    • http://gevenschoenen.nl/ckfinder/userfiles/files/91120013404.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/resaguzegu.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/9444753807.pdfIn PDF document text
    • http://binarbaidrealestate.com/public_html/userfiles/file/kenowogesanoxob.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161399803024d3---38823072408.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/bilavimoveminesebutubex.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/podumigixizozepirozusi.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/luwigi.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/96457288527.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/53606299484.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/lokak.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/rotulukor.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/73547819223.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/844262970.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/49182290944.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/38383266344.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/jalabebesadoveguwuv.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef7d39ad46---nirawujewimugizekas.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/garujo.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/77537434774.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/tepile.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/kezajifif.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/45909264854.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/9192169947.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_off0000d9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E7 16780 bytes
SHA-256: 551ac6b2356220d93f7f0139bd37d646f9cb91ee4c2462d8d3cb67028169370d
font_01_sfnt_off00010559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10559 10192 bytes
SHA-256: 8862f0c8065c55a64bee9f9ead753819feddfd29094682227cc5657bc804ee24
font_02_sfnt_off00011c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1