Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4e0ad2bef0c158a…

MALICIOUS

PDF

83.3 KB Created: 2021-10-05 03:34:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3ccfb4f762ae71ed7e0dae9a9b52f813 SHA-1: 0f7726cea3124e909d1130401c27089b1c0ec81d SHA-256: d4e0ad2bef0c158a4c0bf1d8511a8ae4c8d2c489fa2b7ec46583727dd7069dd1
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, many of which point to suspicious domains. The 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics indicate a pattern of using algorithmically generated URLs on disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://comitatoamiantovelodromo.org/userfiles/file/ruvalexodepolomoko.pdf In PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/de2c9ab2d91f3ff5cc381513905de123/rikobuboxexijugaxeta.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///85865616935.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/41866649489.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/majixeramemupofo.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/83495499894.pdfIn PDF document text
    • https://kaimano.it/file/zomijerexurekasinuj.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/43422811620.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/76119509054.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/setuzejosapo.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/novebajovelululivowatet.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/40263877250.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/vunepajofixebibeduda.pdfIn PDF document text
    • https://kede.org/userfiles/file/30827248357.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/webibirijukigizupil.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/72407950294.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/masaxovanutegedij.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/tomadixojotakeditaru.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/42808307668.pdfIn PDF document text
    • https://angem.fr/userfiles/file/zarafotafotupikoguzegenip.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/64430104646.pdfIn PDF document text
    • http://melodylavernebettencourt.com/media/file/68709051367.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/73681730846.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/77306225943.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=the+angelus+prayer+meaningPDF link annotation
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/gakuxibinugexodinanupaku.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_off0000dce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F2 19256 bytes
SHA-256: 9001822d6c856da284b33c7bfe94998eec030cbb7ce7ac348db98206667219d8
font_02_sfnt_off00012745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12745 10660 bytes
SHA-256: 2c7f8840c143929d6e9f25e1b72b2c7288119a8ffb045d036ecf1e7baca469d6

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