Malicious PDF — malware analysis report

Static analysis result for SHA-256 9367597f8f168f3f…

MALICIOUS

PDF

81.3 KB Created: 2021-09-19 02:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 243c97ddffb6b3ffa4ddedc9c2eb1783 SHA-1: bad0646aca631bc6efa325721b274ae6bd753a60 SHA-256: 9367597f8f168f3f8b835113cc535a06ad62cd8b886b99810c382f36a2bf59a7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous extracted URLs suggest the document is designed to redirect users to potentially malicious sites. No scripts were extracted from this sample, but the overall structure and heuristic firings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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.
  • 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 http://stauarchitetti.eu/userfiles/files/gunogoposetuxubor.pdf In PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/fexukubulexalet.pdfIn PDF document text
    • https://podimercrm.com/img/files/64725488856.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/34857197542.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/75469266782.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/wuvobelirokitigut.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/2041077424.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/234196430.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/81157081197.pdfIn PDF document text
    • http://ewtch.com/upload/files/buwol.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/repukakovulubesuwajom.pdfIn PDF document text
    • https://harom.ro/files/file/22170825868.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/vekadunalus.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/5287872996.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/96244712594.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/58264428905.pdfIn PDF document text
    • http://whygzy.com/Media/Uploads/files/17848973526.pdfIn PDF document text
    • http://dsagco.com/Upload/file/dewukidudufukulig.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327857be84d---93358916493.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/79846463091.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/90914408396.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/senefevajubifako.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/41970104668.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=movie+hd+masterPDF link annotation
    • 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_off0000dac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D6 17580 bytes
SHA-256: 919d5fe62350e45c157b830a91d2e7552a2fdbc6bf7fef385ad2a4db841446ff
font_02_sfnt_off0001204a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204A 10424 bytes
SHA-256: f98334098c897f4f2439b3cefec089d57f35fa6ec6f400d27d8d8a7cc65d9416

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