Malicious PDF — malware analysis report

Static analysis result for SHA-256 c29bbfeeb567bcc1…

MALICIOUS

PDF

86.8 KB Created: 2021-09-12 19:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: a792b9f503a684d5aab6d417893cc19c SHA-1: 8c4f747e7a1d90955fbd8e712e79d06706951ac1 SHA-256: c29bbfeeb567bcc11b1069f76367743ff63efe04936bcddeef50e245691d0a44
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a security-bypass lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343fd50e986---13541406273.pdf In PDF document text
    • http://drtamerturan.com/file/97078088370.pdfIn PDF document text
    • http://asid.rw/userfiles/file/25109977919.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///vovegugafigaz.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161377bbf52fc9---41544871772.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/jujowolowiton.pdfIn PDF document text
    • http://gewald.ru/content/Files/fupajukapegaviduvemoza.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/23211825544.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/1247408266.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/pagekanikifuxumuwodito.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210903112716.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/76300776110.pdfIn PDF document text
    • http://europavloeren.nl/siteimages/file/17234007833.pdfIn PDF document text
    • https://jurvamartin.com/userfiles/file/moxodugilopuxepigex.pdfIn PDF document text
    • http://snft.ro/media/file/36564297310.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/mesolixonuvagezagir.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/45274779058.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/35249908820.pdfIn PDF document text
    • http://gdgom.com/upload/file/210908200350243378lrn8o0hwpsut.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/89487273304.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/39850886631.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/dibaxoliz.pdfIn PDF document text
    • http://ranch.pl/files/file/lezixusagazosixo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=attack+on+titan+wings+of+freedom+mod+apkPDF 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_off0000e11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92D 22524 bytes
SHA-256: 9c71e9f38927634653287e76514285d1000a68efc3d6a90f52bdd7be023747ff
font_02_sfnt_off0001349e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1349E 11076 bytes
SHA-256: 2e993e2fa35b61058e15d561e16b00c3d4481545e5cd5ce1b7a2dc2d718b45a9

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