Malicious PDF — malware analysis report

Static analysis result for SHA-256 a655caba59933d53…

MALICIOUS

PDF

95.4 KB Created: 2021-09-16 04:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: c95632e40f41361fea1a21c9e6065722 SHA-1: 7fd5092c895fe7e719f712405ce81daf6198baf6 SHA-256: a655caba59933d530e8121fa27683e35c1ed58010eed124f345153f4dac855bc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://coretry.ru/uplcv?utm_term=new+super+mario+bros+3+ds+rom+hack+download PDF link annotation
    • http://mayingiabao.com/upload/files/39790786377.pdfIn PDF document text
    • http://falcon.dk/sites/default/files/webfm/24011718622.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/30319844549.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/73107187784.pdfIn PDF document text
    • https://ikima.fr/uploads/file/xijokax.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/37080618892.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/vabiribofuzunuxalax.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/damemarezi.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/notufamunag.pdfIn PDF document text
    • http://gespk.com/userfiles/file/22771929557.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/zimapebokanapupug.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/81709656910.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/88485025496.pdfIn PDF document text
    • http://cleversystems.ru/userfiles/file/kupexejasezuvajukoxal.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/vofapilidifesewukoxarawux.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/wivasisuse.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/94224331381.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/75828975242.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16136af33f2006---48370693748.pdfIn PDF document text
    • https://ksboutlet.com/file/files/5720664201.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/68956614674.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/41372897015.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/50478901793.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/pejuzedisitijebinem.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/5078909471.pdfIn PDF document text
    • 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_off00010b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B90 19032 bytes
SHA-256: 8130a34c1fee4caed90e150a460e994b669fc1b1dc654a533f3c07b5c6494ab6
font_01_sfnt_off00013d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D4E 11248 bytes
SHA-256: ad6010eb45982d953c99ec18e3eee99cc5bdb0200134e2e68fc3eb223e6710d3
font_02_sfnt_off00015759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15759 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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