Malicious PDF — malware analysis report

Static analysis result for SHA-256 0724067faaf47f78…

MALICIOUS

PDF

73.9 KB Created: 2021-09-08 23:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8bf4894240d8121b27d84f03cefdd2fc SHA-1: 7f149d0c1f1b6932a95905f7616eeec0d2ef8663 SHA-256: 0724067faaf47f7833e28daccc443f780ab2f4f43ccd7eb4159a5f68ed41f3ee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host multiple links on disposable domains, likely to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attempt, potentially leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://ku4ysk-9lgp4y.com/contents/files/giwokifugogategeteseku.pdf In PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/54222800795.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/27726761595.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/pimowavazilow.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/5e810382dd071e96a84fa900d65fbf4e/54269047751.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/jilejafagej.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/71265328914.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16133752b2c1d9---rimudepuwugadujifazipux.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/tivikemukifozevab.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/fuzuvugewopivage.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/10369559706.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/39574688155.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/vugaboniniliwud.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/1431627342.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/dowiposekisar.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/72017401741.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/nobozogovofuvosen.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/bivalekufowiwewaxadafep.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/wibezowoxevu.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/dekulata.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/keguwimemadokumopo.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/zaxifovoked.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/nisuxifil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=textwatcher+android+studioPDF 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_off0000b59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB59E 10672 bytes
SHA-256: 051815941a02be477c64e70a9c1c0c5fefa6283f4d4c2429d63d70460e4bb146
font_01_sfnt_off0000ce29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE29 19924 bytes
SHA-256: c0223213ceeb4fb2dc3fd10106cd9459966edb58f77aa1733c601ad7bc4ef879
font_02_sfnt_off00010235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10235 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1