Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5187621fd79fd90…

MALICIOUS

PDF

69.3 KB Created: 2021-09-30 22:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 0101f06a6dcdbbbc5802344047778ee5 SHA-1: 9819e9e4b3dc11879a15f3b0b65eabeb51d44bb1 SHA-256: e5187621fd79fd900b93f9b21ffd747ab7d3be00eb57f3f33119bc1d3de91b7a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://inwebjor.ru/uplcv?utm_term=best+way+to+transfer+photos+from+android+to+iphone PDF link annotation
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346ebedf258---sudikutuzajibomorigugap.pdfIn PDF document text
    • http://dejonghenico.be/sites/default/files/file/78509657070.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/rijapiwezanepetuja.pdfIn PDF document text
    • http://poultech.net/d/files/13871732739.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/tazire.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/58314375524.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/nunojenijujok.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/zamikabarekagujowelu.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/5377243209.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/6056279454.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210908_90E86FB932A76804.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/pazoxit.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/kexokaxikamotel.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/baxotewivoge.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/zumeregemekamidubezok.pdfIn PDF document text
    • https://harmony.im/userfiles/file/geroguta.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/lekuxarelekofezu.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/katijagokajuvure.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/74303863336.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/wogigudaz.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/favis.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/winunaxe.pdfIn PDF document text
    • http://njxinbell.com/upload/files/genitibadag.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_off0000b070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB070 14784 bytes
SHA-256: 9fce3b355f26f92550ea81ebf3a81f7530e429b81d2e3d9e0a1122b154a18c4f
font_01_sfnt_off0000d5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC1 10972 bytes
SHA-256: 36bdbc28459d657fcc871a92406ef88d8a284515fe502d8cc4d009062c3e89b5

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