Malicious PDF — malware analysis report

Static analysis result for SHA-256 c00e491c16cc981e…

MALICIOUS

PDF

83.7 KB Created: 2021-09-18 13:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2212c1c6ba634dd5bb42ec00fb30b72d SHA-1: deb16df28a1333b810b1dc4121e4022a0f4e9fc7 SHA-256: c00e491c16cc981e69928745e615e5802067385cc4c4d30bf90cff6880ae739f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or redirection scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://huntic.ru/uplcv?utm_term=sao+season+2+episode+list PDF link annotation
    • https://amzentransportationindustries.com/admin/imagetemp1/file/32445570757.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/budarodexigukuvezigise.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/57566932707.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/fitobigajiw.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614521f9cfff9---76404803905.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/19842988899.pdfIn PDF document text
    • http://brukbet.com/user_images/file/74766689607.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/35650254598.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/mapiketeziweropud.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/73034827539.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/goperer.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/99354965324.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/vusejadimuw.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/30184348102.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/nowag.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/gukob.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/xejezobuxuso.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/77456297671.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/80528704543.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/wefikozafunajetam.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/jubaro.pdfIn PDF document text
    • http://dfzh.jmdftour.com/fckeditor/userimages/file/lodirevepevabor.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC31A 18348 bytes
SHA-256: 7689d43932b439da1bc4e7c95c7f3133dd45e6dbde4b17abd97f646979ebf6b5
font_01_sfnt_off0000df97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AE 10480 bytes
SHA-256: 291d489ed7af57057dbd2a6fbbf25c1773a77f19c8a58e070ac5b94cdefd4f59
font_03_sfnt_off00010fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA1 18864 bytes
SHA-256: bff3d17bed12f2960cde4e3d7776e2c34991a6332ec1a5871907c33562e81227