Malicious PDF — malware analysis report

Static analysis result for SHA-256 b56beecf40cec28f…

MALICIOUS

PDF

81.3 KB Created: 2021-09-17 22:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f65a8e2821e71d1a9a866d48b3d4fef6 SHA-1: 8ebb798dea24f703698299c85074af27fcd018c1 SHA-256: b56beecf40cec28f79caa5a29cc0116c913d35dd4dccd5947a878c412efceab6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting and are used in a link farm pattern, indicating a likely phishing or malware distribution attempt. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this. No scripts were extracted, but the overall structure and URL distribution strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=watch+mickey%27s+house+of+villains+online+free PDF link annotation
    • https://bawaniint.com/ckfinder/userfiles/files/77174633914.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/vaxolijiduraxixisipavin.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/porisasilabawi.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/pawewagugu.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/40257975943.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/64869530794.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/vudinikawoxejuzimu.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/nonole.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/motojegovuse.pdfIn PDF document text
    • https://safecampus.in/cmsCart/upload/file/vinekozesesuto.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/11965891981.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/72883362190.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/1cc910a58636e7de6a1f22b24ca871ef/56526615541.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/jutifunofisubepilegozikox.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/dijup.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/6162675574.pdfIn PDF document text
    • https://www.e-oswiata.olesnica.pl/ckfinder/userfiles/files/toxinesinomut.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/50327813341.pdfIn PDF document text
    • https://fundacjanadzieja.com/images/wyswig_images/file/rolulediwivubagenawe.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/zeromiviwupozaket.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/52763671222.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/radamupuberesokutovupo.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/72473136247.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/fatajetutugav.pdfIn PDF document text
    • 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_off0000d880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD880 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF097 11000 bytes
SHA-256: 183521d5269302082eded9186f17dd66f3198c60d06eece50726dc54ea3b8998
font_02_sfnt_off00010a17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A17 17608 bytes
SHA-256: 8db01b6b7fbb2306585d9e37312ca42a6945340bc274d6fbcb4d46272bbc8479

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