Malicious PDF — malware analysis report

Static analysis result for SHA-256 4133a81e19503a45…

MALICIOUS

PDF

72.6 KB Created: 2021-09-30 12:34:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 721bfaf812f1fa65df5232186dd34b6b SHA-1: 0be05f643a09d5368f29d3076547304c58f988d1 SHA-256: 4133a81e19503a451b5b362688294c624d9aa7da7eaf0b4c3699953e8e897590
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various PDF files hosted on different domains, indicating a link farm. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggests this is a malicious setup. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification. The sample likely serves as a lure to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://xn--2osv9pt2jfpt.com/uploadfiles/files/87529914341.pdf In PDF document text
    • http://urs-certification.com/gais/image/file/lixapeva.pdfIn PDF document text
    • https://highrise.pl/file/99484690439.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/44386671922.pdfIn PDF document text
    • http://ashokarefrigeration.com/userfiles/file/38206156930.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/lesimuvizalijafofekid.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/tivulepumitidomiv.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/vbh0i356tuo97mg1bbhv5r8d24/4923124062.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021091004265670554.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/52973958802.pdfIn PDF document text
    • https://eniedu.com/data/file/20210929144912.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__6135224D5D6E0.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/pigaroxedonijab.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/39538039616.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/jizonataredika.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/xatenuxiwabezeviman.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/lusap.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/garuse.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/vinimuvufimigomi.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/87962715288.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/51398769184.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/14446522400.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/vevameropujovapeko.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/bomabuzeliromusobe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=roblox+universal+aimbotPDF 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_off0000b1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA06 10720 bytes
SHA-256: e3b6aafc14dfa1a0ed2d50fe313483324f9f97099c491b69e5e8139a51584b63
font_02_sfnt_off0000e2ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AD 19704 bytes
SHA-256: b943b53c27e5d5bb1b4ee9f9ab2f8be6b9cca14ac0d84180889bfdaf3ca54ebc

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