Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c5f8c356012c34…

MALICIOUS

PDF

92.4 KB Created: 2021-09-09 04:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 16ec5a58ccd69873961766551d786252 SHA-1: a001d8cf2eaf13e6ce0dba20e7b390744dc477e0 SHA-256: 21c5f8c356012c34cf8442f96af55fcb7bd6c3431ac80c5a5948c3f23bf7145d
174 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links, with a critical heuristic flagging it as Pdf.Phishing.Trojan. One high-severity heuristic specifically identified a link to an algorithmically-generated URL, suggesting a malicious intent to redirect the user to a harmful resource. The presence of JavaScript indicates potential for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://ride.hu/images/uploads/files/60772636363.pdf In PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/bukilikewokezebinupas.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/tolorukuxufuxifatatoteb.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/32563031283.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/pewusoderavesilizanak.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/duvunivekolebusoxezidobud.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/ravowetuja.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/duvibifi.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/13322983482.pdfIn PDF document text
    • http://pmcp-avac.com/files/upload-ckfinder/files/riwekinubikaju.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/23732762572.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/wofosadozukirumapu.pdfIn PDF document text
    • http://lukinserv.hu/file/nelividudaravukaritij.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/fusejoziful.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/rozaxatemop.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/32058588619.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/25801480193.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/56090698438.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/majixeramemupofo.pdfIn PDF document text
    • https://lordoptika.hu/files/files/96982338964.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/90022034357.pdfIn PDF document text
    • http://gibisch.org/files/files/pomuzosonanetiselawi.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/f029fed93eb7d86867f3ea2da8578ddb/74172369989.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/35621175413.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/kitesefixujap.pdfIn PDF document text
    • http://rimini-portal.de/bilderarchiv/file/64933218799.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=redmi+note+10+pro+buy+in+sri+lankaPDF 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_off0001005b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001186d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186D 18704 bytes
SHA-256: 1a575cd1b73e1d4fc787f092f4af1490fb2da3bd0e2a5deccefcadb4da5d2195
font_02_sfnt_off00014971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14971 11216 bytes
SHA-256: 17145e89ca5fa4aaf9d11f7983925678a7e4cb9c8e869bbc8be25ea6204d3d58

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