Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f24e2eb00a6c50a…

MALICIOUS

PDF

86.4 KB Created: 2021-09-21 17:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6315b5df53da0c5830d012e820b45013 SHA-1: d56237377b1b0464f1938fd61ad083e96a09b1b5 SHA-256: 1f24e2eb00a6c50a270a97ef692fccc04cc630612ffdaaf8cdbd0592d14b05b9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external links, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=bbc+emulator+android PDF link annotation
    • https://hanomanberjaya.com/contents/files/zerakujoxeveza.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/lateromuve.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210913020340.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/rizaravawi.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/wiwulexetawebim.pdfIn PDF document text
    • https://digireg.gr/upload/tovesepimu.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/1750152523.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/15944842857.pdfIn PDF document text
    • http://519pf.com/userfiles/files/wifurimavavepapuze.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f78a79addf---pafusokuz.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/jebib.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/77189853806.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210911_C68A871BD36D9641.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/95995822736.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/fuvamixelegavoj.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/kegomesikore.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20210920110802.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/53046646375.pdfIn PDF document text
    • http://icaalliance.org/filespath/files/20210913145929.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/denazozifu.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/dilulasisomememu.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/40164242047.pdfIn PDF document text
    • http://llux.vn/uploads/files/91619214325.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/22364252083.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/godizunapafegekavatoke.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/xaruwezizin.pdfIn PDF document text
    • http://belniig.by/public/file/71986492178.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614395d5b5cf1---kafokowetuloxafe.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_off0000eb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AA 10656 bytes
SHA-256: 4ee79aeb25116f08ada4de73ae979caaf2620bcf34381d0a0063966251c5a6e4
font_02_sfnt_off00011c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0B 18240 bytes
SHA-256: 33b1d84fd26bd83a2381c6d4b6e13376b625467bda50f2ba2919acc1828c039f