Malicious PDF — malware analysis report

Static analysis result for SHA-256 c10836ffd2e8f519…

MALICIOUS

PDF

72.2 KB Created: 2021-09-30 21:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c731bbb70c85ea763c292ba9b4aacb60 SHA-1: d160e5263e69dd321df39d54b12e2c118ea8adbc SHA-256: c10836ffd2e8f519d230f2eac68a7dffc45d6f91f94cfd205af2a52f535626c7
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with a heuristic identifying it as a link farm hosted on disposable domains. This suggests the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://towa-aaa.jp/userfiles/file/69146935804.pdf In PDF document text
    • http://www.reeder.ee/files/filemanager/79571406541.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/tufusilaj.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa59435565---16198694268.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210926_0075F4BE097FF35A.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/dufuw.pdfIn PDF document text
    • https://krusomying.com/data/file/92087802868.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/varilobudidaw.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109210518178535.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/01te7q020ekh8tej4crbfv6ltd/fevedosibej.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/16143523780.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/tudexumo.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/76856773923.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161303602e6b92---76230458593.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/94830062091.pdfIn PDF document text
    • http://appextskihjthj.handylover.com/upload/files/2388466308.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/82813237168.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1631813266.pdfIn PDF document text
    • https://bursac.net/userfiles/file/rativexi.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210911092556.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/tatupekegisusuwirix.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/23728292872.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/movukumogum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+use+my+phone+as+a+remote+for+firestickPDF 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_off0000b520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB520 11084 bytes
SHA-256: b3c1217893c163f6aedbbf1c1aa11560f2cb58789fe0626c6709f46c844f6473
font_01_sfnt_off0000ced9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED9 17056 bytes
SHA-256: b00bff2572a1610722a5d004ed20e491052e73587e62427db7fe07f4740a55c6
font_02_sfnt_off0000faa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.