Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd8f1b3d66ba3db…

MALICIOUS

PDF

81.6 KB Created: 2021-09-21 22:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3b54617c43500fa23d101245a5dda35e SHA-1: aa5979b15947aee8c81a111d5f73001a5abe0755 SHA-256: 5fd8f1b3d66ba3db65955b62336f1a1460d13cf51b8366b50ba35210fc8306eb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous embedded URLs that point to a link farm, suggesting a phishing or scam attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by identifying a large number of distinct hosts used for hosting PDF files, likely to evade detection and distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://salman-is.com/userfiles/file/19275414608.pdf In PDF document text
    • http://mobydick-band.de/fckdata/file/dujefiwaluxibew.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/tikekisexolutopi.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/31786967039.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/82997796230.pdfIn PDF document text
    • http://wonikquartz.com/upload/editor/file/1630475765.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16136dc21b3a54---21434283110.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/wudutikutuxevejumupulenin.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/48811275966.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/2021916157341555.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/99065186443.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/mejuzuv.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/detazekejuvokote.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/42263716199.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210903082258.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/51171068034.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/12893816850.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/67267028945.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/57303001197.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/fididawosisoxogesev.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/ranividefuwateza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=minecraft+mansion+ideas+modernPDF 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_off0000dcab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAB 10584 bytes
SHA-256: 9aa93a8a2affcb1fa0505587ab1cd46f291f81a4170b458c28878a705a746593
font_01_sfnt_off0000f4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEB 17168 bytes
SHA-256: 4d522241c1af8ba4dd29c1f97b5f4411a856e100e0c77e4048b375ed990b7a93

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