Malicious PDF — malware analysis report

Static analysis result for SHA-256 010269f9ed8fbd90…

MALICIOUS

PDF

81.8 KB Created: 2021-09-19 06:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e21c2db2355e0420afec3968b96e04d3 SHA-1: 809f15c4b41e8ea5a700caee8bbdee73d27a24c8 SHA-256: 010269f9ed8fbd90ff1a02a7680b4505cdae84d1e7f79f0a4e813cd9ee1b8a9e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

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://coretry.ru/uplcv?utm_term=cut+the+rope+gold+free+download PDF link annotation
    • http://alhouti.com/userfiles/file/jadibiwafikofoliza.pdfIn PDF document text
    • http://polipack.ru/content/file/60781133383.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16142c7b017dc3---52204213638.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/fivaloririvane.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/97850350345.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/64461879712.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/77120367308.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/galufun.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/35729889569.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/14181270388.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/momobazuvebujoma.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/19950235256.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/joxigapamunawenibotivora.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/61303799025.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/49411685509.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/popibodewagoxiwirivodo.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/78366540190.pdfIn PDF document text
    • https://tmtteks.com/files/24174990288.pdfIn PDF document text
    • http://abnicum.ru/files/file/93299602417.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/danozedalolezege.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f225a24585---45610917456.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109022129217694.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/89541319745.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_off0000d5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CC 10732 bytes
SHA-256: a25d3adecbeb2c62eed87802fa1f67596fb265a7020062353c07f4040c656463
font_01_sfnt_off0000ee51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE51 19636 bytes
SHA-256: e4be27ddd83287ef3d1746a9cc350c0a01fd5e8db00f464f0f15cff31a9e9ca2
font_02_sfnt_off000121bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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