Malicious PDF — malware analysis report

Static analysis result for SHA-256 55424245becac7ee…

MALICIOUS

PDF

77.7 KB Created: 2021-09-18 12:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 30e60cc9f8c539c07858a830a3a21009 SHA-1: eae1514fc1e9d703e7629486c95b0bb0da56c283 SHA-256: 55424245becac7ee4b0a38cfe19f6eeb33454c3f43361b66c68c4ef7a13105a0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 5

  • 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.
  • 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://izometal.net/mm/file/kapuloviluvofenemefatoto.pdf In PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d5de3ceac---6310664675.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/laloxirabaliworowabane.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/gapezefuzenogulepaj.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/xuluvugilu.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/padotalopulixodufip.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/73516186004.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/liponepuxavefinuz.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/lezobe.pdfIn PDF document text
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/77449949229.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/84152826543.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/58779325191.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/72664337539.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/28589990842.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/22571115917.pdfIn PDF document text
    • https://visualarchive.bg/files/sajazebozowobom.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/35048551559.pdfIn PDF document text
    • https://termofriz.rs/files/97221879877.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/19924592522.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/lenilexikobofe.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137547ddbfb4---61923820042.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/ditemog.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/bugazaxagafeziwopafexom.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/xosanevurapulilosajiwal.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109150647049788.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/70833305546.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+format+motorola+phonePDF 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_off0000cad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EB 10440 bytes
SHA-256: e403f20a233e63fc5ba0b7e17079d3cee2ae22aed33d829fb9a6578822e93f16
font_02_sfnt_off0000fa67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA67 17816 bytes
SHA-256: 472bd1c06a45e7e89b2c2b11abaefbcd45790ffa0687a0596df71aeb49a32105