Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a6f251411d8a3a6…

MALICIOUS

PDF

84.3 KB Created: 2021-09-13 19:08:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9c2706d12aa8c7d446641171467fc4d3 SHA-1: dde98b135dab18b191f5e5f8743fad02ec720454 SHA-256: 9a6f251411d8a3a6854898c5a6286a034749381cdf000c11bbaff5f6f75110b8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://fablab808.com/nbloom/fckuploads/file/54113296264.pdf In PDF document text
    • http://stellamaris.cz/userfiles/56956148561.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/26971465402.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16132fb0b09428---datafupetetip.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/wanije.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/43929924249.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/49316342574.pdfIn PDF document text
    • http://velomagazin.hu/UserFiles/file/dikiwus.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/24309946851.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/93994163420.pdfIn PDF document text
    • http://cecev.com/stockages/files/23920657460.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/55856739201.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/ralugonadurupekevepuvizeg.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/robujagidedunuxasaximuji.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/titusabinesefenarafuro.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/50477715959.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/sazemamujijumusepovuz.pdfIn PDF document text
    • http://cochemical.com/upload/files/romekurixox.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/65453326377.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/latezafizew.pdfIn PDF document text
    • https://upaspor.com/resimler/files/dasalogewidadiso.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/96408785866.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/dozuki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=4k+photo+editor+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_off0000e3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C2 18712 bytes
SHA-256: c7acce54a4c00f70926ac221fc0d15ad1aa05d9fe37ab841c991a750861a85e6
font_01_sfnt_off00011481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11481 10244 bytes
SHA-256: 87faff53524bc91b8875cdd709a18d2b24cc1345d4743dc20816bc85363ac00a
font_02_sfnt_off00012ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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