Malicious PDF — malware analysis report

Static analysis result for SHA-256 561e161991760aee…

MALICIOUS

PDF

69.8 KB Created: 2021-09-30 15:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 21615880c64cd95af271b5e1279f28a9 SHA-1: 55b6ee8ec1438419de464c3300207b7367524bc6 SHA-256: 561e161991760aee63f220504ad9c915032464830b73d03db37d6497f51cabda
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, with a critical detection score. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of numerous external URIs, many pointing to potentially disposable domains, further supports a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://antonellascarpittadesigner.it/userfiles/files/nomive.pdf In PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/bixatobitixepan.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/82328046353.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/76994056787.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210903_C6934E107583C1E6.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/28285108366.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/loxuletudozumafudemo.pdfIn PDF document text
    • https://seerupit.dk/assens/file/82973284882.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/futemuluse.pdfIn PDF document text
    • http://hiniceshine.com/upload/63987478540.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/64710576662.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/97805686982.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/95177658342.pdfIn PDF document text
    • https://yakin-surewin.com/media/file/88054478663.pdfIn PDF document text
    • https://investkwik.com/userfiles/file/kitavafiwidedukid.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/67891558636.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/dfc9bcb8a87afc67a4db44fe2ec66189/93754983075.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/tixamifokijodexifuk.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/93565472535.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/topaneze.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/53164221025.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/70627125222.pdfIn PDF document text
    • https://superlitefan.com/uploads/files/wivajifebeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=cricket+pitch+length+tennis+ballPDF 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_off0000b1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B2 15448 bytes
SHA-256: 3ce9903076cbeceedb7ba813a6a6b755ef206770060c0dfa63b71944939e1517
font_01_sfnt_off0000d8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FB 10796 bytes
SHA-256: 774a46449a1236196dc59a030750d20c11fca668f455e2a5a79b552973edde71
font_02_sfnt_off0000f19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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