Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae9e3446751d5534…

MALICIOUS

PDF

77.1 KB Created: 2021-09-23 18:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2838c07e6632a5c011f4f00d8a3b4e88 SHA-1: 110ac8e30018d394049fb3547a611d0e6ff2dddb SHA-256: ae9e3446751d55348fa5fa750307f6eed7df250a07718c64bdfd9bb0956d8455
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains multiple links to potentially disposable hosting, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the presence of numerous embedded URLs points towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16142bc020839b---wisezafobawabinomu.pdf In PDF document text
    • https://benqmusicworkshop.com/fupload/file/63342131557.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/198351371561433ac99be4e.pdfIn PDF document text
    • https://uudanbury.life/files/file/lobopagotafem.pdfIn PDF document text
    • http://i-physiology.ru/upload/vikukatobukepojivesaxupo.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/57983338516.pdfIn PDF document text
    • http://www.toptehnik.si/images/rewibefaneji.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/76378110584.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/42052401480.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/34861078556.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/22849677509.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613431cd2d65f---23506434530.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/673550353.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/54564564775.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/ruseru.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/xewenolalawibo.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/rujalupabu.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/dositewujimafabuwoke.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/vitiponusi.pdfIn PDF document text
    • http://btfa.tw/upload/files/fabujijewegobazerini.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/13612560485.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/fumunejutuguvexaxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=avakin+mod+menu+2021PDF 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_off0000ca93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AA 10532 bytes
SHA-256: eb8ab42ab7fd2c42b459288641863280a7f0c91c00d0e01c51a96237e743103d
font_02_sfnt_off0000fab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB0 17124 bytes
SHA-256: 9625fef6a26a8375ab782cd0fdbf8e78b5f3447cc35a70df1f2a7dc4a994890f

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