Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca713239e3c4f9b3…

MALICIOUS

PDF

85.1 KB Created: 2021-09-09 08:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 217698dc4109337ca9661ba8dae81ddd SHA-1: ee2ca8ea7843f42c0aac40d2ac8779d465960c79 SHA-256: ca713239e3c4f9b358be4c875a886ec6003730b0fd55c8d6ccc80a081c9872f4
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. Heuristics indicate it functions as a link farm and potentially a phishing lure, with one URL pointing to a PDF hosted on a suspicious domain. ClamAV detection and ML classification strongly suggest malicious intent, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://studiomistretta.com/userfiles/files/77861535100.pdf In PDF document text
    • http://khonggianmang.com/upload/files/80704128968.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/madakibevoteta.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/82672792657.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/94884528424.pdfIn PDF document text
    • http://machin.kr/userData/board/file/doluvakudomovikagakoro.pdfIn PDF document text
    • http://asqcert.net/files/files/99041792439.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/c7f3e427daa357200e5fcdfedc9088a2/29221058585.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/33654682294.pdfIn PDF document text
    • https://bkairconditioner.cloud4demo.com/uploads/files/69904524056.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/76413268227.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/62428175652.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348418db5e4---fukuronakujenatokabo.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/54259896825.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/rowiwenakajozegemazi.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/70388424663.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/kipagudatexuleg.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/tozumanupavoxekuzeg.pdfIn PDF document text
    • https://gianlucabruno.it/dati/upload/file/55201609608.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/diwozakekejuvavujov.pdfIn PDF document text
    • http://agrion.org/upload/fichier/15561777723.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/wilirifurefapokexibebatin.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/tumuniriwazikawosalaxug.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/98787992661.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/wafijovuzix.pdfIn PDF document text
    • https://bloomeng.com/uploads/lixem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=watch+need+for+speed+movie+online+free+123moviesPDF 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_off0000e5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BE 17800 bytes
SHA-256: c5fa1465710bfcd083f363da965dc6a9455ab7e7811ed6906c5f24e7ea0025b2
font_01_sfnt_off000113cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CF 11288 bytes
SHA-256: 008da6cf1774600a54d5aa9f656aa5a2deaf6f467506db494f330f08be429971
font_02_sfnt_off00012e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1