Malicious PDF — malware analysis report

Static analysis result for SHA-256 adc8739da2c9fcda…

MALICIOUS

PDF

68.9 KB Created: 2021-09-25 16:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a3adaad1d521b83ebb16360efc657e29 SHA-1: 8d04714042bb25ad80750292e92cbb125d7ecdfe SHA-256: adc8739da2c9fcda1b61e098de1ce588281effea46c88bb57e66004573c77f8e
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 are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://infrive.ru/uplcv?utm_term=codes+for+getting+free+robux PDF link annotation
    • http://www.guus.edu.mn/ckfinder/userfiles/files/34365306962.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/94308889142.pdfIn PDF document text
    • http://songdolandmarkcity.com/userfiles/file/23710622488.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/17874415253.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/gasipolavena.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/92384436533.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/77833111788.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/kadutamodigofaxaw.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/72096576059.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/34347302928.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/50bfcb3c8a3a3450e7750cdc8a5b2f08/xebibigosuxexezafunu.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/65790232695.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/nojedapanefivoz.pdfIn PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/30157297608.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/vesovepowo.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109030902162637.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/35528653507.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16149ae1d23557---97488930099.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/73281976205.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/21332554057.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210911051953.pdfIn PDF document text
    • https://marthomaktrplrdiocese.org/ckfinder/userfiles/files/59061321479.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_off0000ad44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD44 10696 bytes
SHA-256: 50ea6e421e5eadbf6bb02f955bd06f018c0369ad3049c34578f5989699566ebb
font_01_sfnt_off0000c5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ddd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD0 15944 bytes
SHA-256: 195d028d02a23c0a69dd5752ea454f69c01f699a3ecb6b8b65ff4e5a86cb6a60

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