Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6bdde4f16933835…

MALICIOUS

PDF

75.2 KB Created: 2021-09-24 00:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 100d35808ba7bb60d5d2e6fc53bd9713 SHA-1: a1c9dcd87bcdfdbe1291c1b14ba0c52c6bc6c92a SHA-256: a6bdde4f1693383546e99f9f7b636459c581d03fcf273b86479d28e2870ecde5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs, many pointing to disposable hosting and exhibiting link farm characteristics, strongly suggests a phishing or malware distribution attempt. The ML classifier also returned a high confidence score for maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=minecraft+apk+download+1.16 PDF link annotation
    • http://uro-medical.pl/zdjecia/fotki/file/41908086468.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161374b205b02a---90454130267.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/76514068765.pdfIn PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/wememofidi.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/renezefujininip.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/tewokurigaxetuxi.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/kufekivuteleguzunajeb.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/96656570260.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/64670734311.pdfIn PDF document text
    • http://cecev.com/stockages/files/18439786937.pdfIn PDF document text
    • https://palet-school.com/files/files/38479510389.pdfIn PDF document text
    • http://zhymwz.com/upfile/file/3186050580.pdfIn PDF document text
    • https://tenhucchi.com/upload/files/tobafosilaramit.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/161460a52d3887---3829612842.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/72858311697.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/95452755234.pdfIn PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/241801_reregikiruka.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/segisumitexivevixezenopu.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/kikejo.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/sekoxaniridexujivow.pdfIn PDF document text
    • https://norservis.com/files/files/24752568246.pdfIn PDF document text
    • https://phukienbep.net/media/files/86356766054.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/kebovabunude.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/948388259.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/kexavuli.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_off0000c196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC196 17300 bytes
SHA-256: 393786c458d43341861554bd11ecf40995a9202e6e7345068cc838c8d05cb13d
font_01_sfnt_off0000edf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF0 10904 bytes
SHA-256: 0cc1d630edc6e70322f6767e5c0bab714f4355486dedd10ccbcec8692ee7316f
font_02_sfnt_off00010765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10765 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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