Malicious PDF — malware analysis report

Static analysis result for SHA-256 23128acf51a43463…

MALICIOUS

PDF

84.4 KB Created: 2021-09-18 11:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b7cbcaedb226d696415aa0e50b546687 SHA-1: 9205089299d6e1a2dbd5a2361128aa47d26fbb27 SHA-256: 23128acf51a43463218456be70e7a2e8240c4b8c84f85d5b4ca7371142673558
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code or redirect users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the numerous extracted URLs suggest a phishing or link-farming operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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=java+server+for+android+app PDF link annotation
    • http://paitoonbox.com/userfiles/files/49523379342.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/49735722561.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///puxonekodefokamivezomo.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/44808509749.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/vunivesag.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/82780285498.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210917201849117.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/42401430467.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/xobutuwufiraki.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/62622413795.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021091220425285.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/3540070875.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/4420987964.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e008e1f009---ragenofepilu.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1631137491.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/51852489411.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614363a59f97e---jatosawikurawurodiwebu.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/65231112926.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/78160048906.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/68456794190.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/suremubobojekaw.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210903_095310.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_off0000e2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB02 10404 bytes
SHA-256: b72d16b54ac62c6473be60ff5e5591e08611b3d967b7b22cd0507b36faed77b3
font_02_sfnt_off000112a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A3 18328 bytes
SHA-256: 107c257d33dc817d90f7cfda691899f78c53efdf6f7d2c4cba0f032a38d17eaa

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