Malicious PDF — malware analysis report

Static analysis result for SHA-256 d13141a18baee977…

MALICIOUS

PDF

76.8 KB Created: 2021-09-10 18:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 5cd4c518710a09f21efb8cce32ff8bb7 SHA-1: d606c6ac8ca10dd6e77694f278cf7a1600aed20c SHA-256: d13141a18baee977910a8b02b68c154fcf169aa4896ae90a605ef5cc63e6b303
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9963

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://obchodsezlatem.cz/upload/files/xejuwefenukajoruzeviwubeb.pdf In PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbd4b8ef4c---89409535041.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/48701387093.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/84703720633.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/vopem.pdfIn PDF document text
    • http://quranday.org/userfiles/file/66086870059.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/xobog.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/71678845822.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/daxotor.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/79357710003.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/wigim.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/41072558924.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/1444264731.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/48603264531.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/puraxuxaweziwotovofowiguv.pdfIn PDF document text
    • http://runo34.ru/attachments/file/rutefigipubarijifep.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/nudoxomure.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/ziteralerudepijenun.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/buzejulotazisufumibaka.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/jowikebe.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/tipifitarofavidavelejov.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/peninepejipegafavugejobiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=the+holyhead+harpiesPDF 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_off0000ca06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE218 17260 bytes
SHA-256: 0ad9436a74306b942469089870d76b047950e7de328db4756b68569c0045c4fc
font_02_sfnt_off00010ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF7 10364 bytes
SHA-256: e95febc8ed28c56f1822e757335eaff362ccc0e787a064344f1cdef1f05c0640

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