Malicious PDF — malware analysis report

Static analysis result for SHA-256 e84e8d0cf40ec16d…

MALICIOUS

PDF

73.7 KB Created: 2021-09-12 14:26:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6b643f04bfde82e77d813cd51178030a SHA-1: 6efe5e5b7f160a18b0392578c7a45b425f304a29 SHA-256: e84e8d0cf40ec16dae16acd267507d84daecadec9bf8247d9bdcd84fb81a19f3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and an ML classifier. It functions as a link farm, directing users to numerous external websites, many of which are likely phishing or malware distribution sites. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement with the phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://medvor.ru/uplcv?utm_term=rambo+last+blood+gomovies PDF link annotation
    • https://expobar.vn/app/webroot/files/images/pages/files/subipewujokakip.pdfIn PDF document text
    • https://dacola.com/upload/files/xokizowutibefarezawu.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/51212108784.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/62857896792.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/zedamigolenegodo.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/8323235066.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/nemowekikozo.pdfIn PDF document text
    • http://hadt.vn/upload/files/wajugofoxewuj.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/30606634188.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/femuxirafu.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/kutasijigu.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/mabuz.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/70122334014.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109090248589337.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/29114247540.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/28593702143.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bb5dc2a47---kuwesepinujopurileg.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/vovojonunosawobizisukig.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/dagitunetezofobub.pdfIn PDF document text
    • https://fundoohairstyles.com/hairstyler/images/file/57809925494.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/rotidezipexulopaxugejosox.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/batijadozijetaxemew.pdfIn PDF document text
    • https://birotex.rs/images/files/zuzimob.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/boxinobesuluxujukaguruj.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/somobibobupijijeroneba.pdfIn PDF document text
    • http://one9five.com/userfiles/files/zojufowomexazotawilop.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_off0000bc55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC55 10636 bytes
SHA-256: a5e1fe684570167529e7a78633fbc3dac8ca729409745ead42019074ba429805
font_01_sfnt_off0000d48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48C 17376 bytes
SHA-256: 1d7a4509c9d6cb2d584d15ba68dc0d92fb596ee60907d8cecfe1ad7c9c28458d
font_02_sfnt_off00010128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10128 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1