Malicious PDF — malware analysis report

Static analysis result for SHA-256 3525fed2f5db0806…

MALICIOUS

PDF

85.4 KB Created: 2021-09-16 07:26:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 655dad2534f595970e167defbdb56cb3 SHA-1: 59e93716c59f3a8e1337de48952abaa08457872b SHA-256: 3525fed2f5db0806faa39b4fb41e68c5897a182b4d92796c07b47ca84076da27
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to its use for executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=headset+app+for+android PDF link annotation
    • http://kunjipsc.com/uploads/files/85567387762.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/nibabutefujom.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f717e253e---rorukimenetoninigiresiki.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/48245918155.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/78587677846.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab97e106bf---mumexotikifusirapuxiden.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210907232426.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/28085782253.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/fisekajifusabib.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/wuliwuxaselu.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303ed90f3e3---jemidoridimuku.pdfIn PDF document text
    • http://elfast.ru/userfiles/file/bujeninubamixosufudi.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/51646519454.pdfIn PDF document text
    • http://abc-tel.ru/data/File/24724086627.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/dotexexinunala.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/81191795230.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/murozutap.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/10388736471.pdfIn PDF document text
    • http://zubrcup.by/files/files/82146519143.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/46627797476.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/vijokopigoxadudofu.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/82933202593.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/54030682808.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/5673510505.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_off0000e900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE900 18140 bytes
SHA-256: 116af76e07dfc291bd87a2f9f4053ef30ec3dd124c4de5c17d75a9f01f671257
font_01_sfnt_off0001183f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183F 10436 bytes
SHA-256: 201a38520bdaebcde8fed53583c826f7a22bc6fb3ed450df2d0d13c5bcebbfc1
font_02_sfnt_off00012ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1