Malicious PDF — malware analysis report

Static analysis result for SHA-256 05be66a7d1594ef8…

MALICIOUS

PDF

82.5 KB Created: 2021-09-19 04:12:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ccf52e7bbba26c8c639f7c2b955d4c30 SHA-1: 4eecf8e0800d1643a277997f9124f41b270649cf SHA-256: 05be66a7d1594ef876c7d6bc5662ab2a81e0f40c1233106389f3a4fdc857f941
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to obfuscate the malicious links or perform further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ketchas.ru/uplcv?utm_term=minecraft+java+for+android PDF link annotation
    • http://oralrem.kz/ckfinder/userfiles/files/vituwozugoponakovom.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/pexamamifopigufuwek.pdfIn PDF document text
    • https://taperagi.com/contents/files/bisabor.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/53967428876.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/76103562238.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161467e334005c---wigavoderipifewiwiziza.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/xefefirifekanatikutikog.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/52293402187.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/lowewelo.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/4875954979.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/51470372927.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/59893337822.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/15714243717.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/kijeliwititimurofemobul.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109121517402628.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/42042093896.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/56381783042.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/52879673750.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144136f3101d---gamibigotesiko.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/zaroliz.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/56703476039.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/93366087956.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/loxofuda.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_off0000dab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB8 19128 bytes
SHA-256: 3ba12baef790bcac514b6f4285f7a801ee977596a6d2948e75c8640cf46e0265
font_01_sfnt_off00010cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCA 10444 bytes
SHA-256: cdd3b1a59b00081f6145b1ac70f1337a84d0df6175b9ef2203d553b16890a801
font_02_sfnt_off00012497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12497 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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