Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c09ece7b97e636d…

MALICIOUS

PDF

85.8 KB Created: 2021-10-09 14:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 755236e59a6e1bf3d5d6cc9c516e52e2 SHA-1: a3a2c57f8fb4e0be3e75c1143137aa53fd2912b2 SHA-256: 2c09ece7b97e636df9677e2f2842300b2e56b7691ea80fd49879f2dbe1d61e3d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics indicate it functions as a link farm, directing users to numerous external URLs, many of which are hosted on potentially disposable domains. While no scripts were explicitly extracted, the PDF structure and the presence of many external links suggest it is designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://cmorshomecareassociates.org/uploaded_files/userfiles/files/69947061988.pdf In PDF document text
    • http://tinhdauvietnam.vn/upload/files/33048568041.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109141309035643.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/55225625435.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161540fe3e8760---zasatuvibanubun.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/vofexoriruwaxevavuwemo.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/pinilozozorinag.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/1716631471.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210918_124243.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/37094304942.pdfIn PDF document text
    • http://archbot.pl/files/file/38268899818.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/razomej.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/69379329711.pdfIn PDF document text
    • https://mediaskills.rs/files/61244597889.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/kuninugagu.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/bazuxutep.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/13277084040.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/2732746982.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/sekoxovawidopuju.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/53182112860.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161406cc98c9a7---88633609336.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/nunokefej.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/tubovazobasolapirapugino.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=doughboats+taupo+pricesPDF 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_off0000e68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA3 10744 bytes
SHA-256: 371aa222dcd6c371ccff7a2fe973b76069462231d4c772a4c5ce1be9db221180
font_02_sfnt_off00011752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11752 19696 bytes
SHA-256: bcee72b9ce17db27811b248e617eb519e3e2bf409628ca0c0bddac0ddcbe9a4b

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