Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a705d4a34907c83…

MALICIOUS

PDF

72.4 KB Created: 2021-09-10 01:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 98d480605106965eeb53f9eea84dd6f2 SHA-1: 2509128b4520353b2f75510e4a0a51daeef7ff68 SHA-256: 7a705d4a34907c830e18ff4726ffa2d66deea286c1f2acaf45278b051aca7c5b
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 0.9973

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 https://allytemp.ru/uplcv?utm_term=caries+vaccine+pdf PDF link annotation
    • http://luijkzonwering.nl/image/file/32155495394.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/zazujip.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/figujemosawifetuximelitid.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/22887477356.pdfIn PDF document text
    • http://kelvista.lt/images/files/23733429104.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/45193193371.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/43014877571.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/xolulire.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/39241613225.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/puvivixozapimizo.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/67356632231.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/vugewed.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210907_01D6134AA9DC9049.pdfIn PDF document text
    • https://faceless.me/userfiles/files/ninex.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/38666087701.pdfIn PDF document text
    • http://yujinpharma.com/upload/files/4027508982.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/wotizimupujud.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/78617988486.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210907_092415.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210907195821.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/mesozisaw.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/83155556912.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/98646775331.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/musadukibagagozul.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_off0000bae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAE5 16040 bytes
SHA-256: df32053dfc0de3e6fccd34a0f80580e66b6d3d5cfc2a90d21ce8b803d1cc58c2
font_01_sfnt_off0000e3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF4 10448 bytes
SHA-256: b966ac8fd1d5bbb31e6d2f7b28f4a3b27ed34d0f9c31a91f8465689a3f7868b8

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