Malicious PDF — malware analysis report

Static analysis result for SHA-256 df7414d6ed9d483e…

MALICIOUS

PDF

74.8 KB Created: 2021-09-11 16:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 21352721578e85fac83d41ceb761461e SHA-1: 8f0b269a750d2568123d9b18317cccd34973c851 SHA-256: df7414d6ed9d483e328b59cdd497349ca5b17fbf5bae0b442c5b455dd2646fb8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings suggest it functions as a link farm, directing users to multiple external PDF files hosted on various domains. The presence of 'utm_term=metal slug game free download for android' in one of the URLs indicates a lure to trick users into downloading potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://dioceseofniranam.org/userfiles/file/3108022204.pdf In PDF document text
    • http://acm-medicali.it/userfiles/files/48407201306.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/59754277427.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/zivafixedomebugututawiv.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/92617014865.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/47303006246.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/dufagize.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/c66c9bc43682a5b275bf6a99ea7563ad/vudozok.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/14358183995.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/78760427264.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/kanizavetenitawone.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/48008659622.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/kiselotinu.pdfIn PDF document text
    • http://charivne.info/images/file/77351966913.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/jabazo.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/23202421293.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/suxibupixirazesinibi.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/79323185056.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/14628733189.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/85143807913.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/lufopemasabovugulodivepe.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/9854572417.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338b00db869---8174904898.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/46401986791.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=metal+slug+game+free+download+for+androidPDF 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_off0000bf15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD727 17500 bytes
SHA-256: 265c7e8f5ab1fa8f8b0bb849dc94610bf8519a37b4ce1cc14261690b95a2a39a
font_02_sfnt_off00010430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10430 10876 bytes
SHA-256: b777da9a1230299fbb4c41152f57f0335dfc980491315cd35e0af73ac0060edd