Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed7ad62ca52077bb…

MALICIOUS

PDF

81.4 KB Created: 2021-09-19 04:28:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6c4a1659f65ee7bd5650c75c2fe2de58 SHA-1: c4a2ae1cddae22b0e9668db869de01543f92cc33 SHA-256: ed7ad62ca52077bb09c8f684239fe4bc3c4ae5b116308aa11ea0c539699028be
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm, indicating a likely phishing or malware distribution attempt. The embedded JavaScript stream suggests the potential for malicious code execution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://pixomot.ru/uplcv?utm_term=software+update+apps+for+android PDF link annotation
    • http://tichdiem.surecare.vn/uploads/userfiles/file/gizupakironokunulilis.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/vonev.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613168c2c0bb4---jesefidovifozadirupuxoju.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/14520118524.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/vodakamufibadivozo.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/xujiwerudevup.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/jekositu.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/16620937242.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/gunosogikamosu.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/81416197373.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/44085041539.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/pokerim.pdfIn PDF document text
    • https://clickbox.ro/images/file/28349456061.pdfIn PDF document text
    • http://teknis.it/userfiles/files/segejovogitan.pdfIn PDF document text
    • https://bczenekar.hu/files/file/20526240203.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/rujivumopofusawesoleniv.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/wizif.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/lulotetogasejanuvak.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee768171ab---puwigavivimikinobarenozim.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/22219198515.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/xupeboxirogidejux.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/22011120868.pdfIn PDF document text
    • http://ukrfirework.com/images/file/8384771527.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/57316405051.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/bosugaxigozumefudasaw.pdfIn PDF document text
    • http://packturf.fr/files/pivazowufatesiseritowefoz.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_off0000d65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65D 10708 bytes
SHA-256: 6509faf284a5a790e7439691d9623f556aa9d120b82558b4fa3df6db385f6d88
font_01_sfnt_off0000ef1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1B 18320 bytes
SHA-256: 61db6be3e26896184690636275d3676f66b4601d6db0c28d3c81f10080a76fc5
font_02_sfnt_off00011f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1