Malicious PDF — malware analysis report

Static analysis result for SHA-256 abc391d4a9c30201…

MALICIOUS

PDF

69.4 KB Created: 2021-09-26 15:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 734308567eb49a532bd1c1aef55d1106 SHA-1: c3438dcaa28c374eabcd9df9bdc287f2493a5e21 SHA-256: abc391d4a9c30201798d9945cd14ccce5873d49e1aac37b7c173e7fb1014dcc2
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to disposable domains and are likely part of a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The embedded JavaScript is likely used to facilitate the download or redirection to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://allytemp.ru/uplcv?utm_term=vision+in+white+nora+roberts+pdf PDF link annotation
    • https://polandpools.com/contents/files/17333011073.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/weponetitilirimajasufuri.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/wuwuvoxaxofi.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/sisiraworuva.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/64190363705.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/97589553433.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/a7c7b2413f9309ef634a9d6f3af643b9/41307422084.pdfIn PDF document text
    • http://ovstav.cz/app/webroot/files/files/zubav.pdfIn PDF document text
    • https://subded.org/userfiles/file/28577267538.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/zijoxikagiretug.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/43098727419.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210920235115.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/morotolatizosunize.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/xavumolokure.pdfIn PDF document text
    • http://ambulatorioveterinariosanfrancesco.com/userfiles/files/49001688342.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/45472710833.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/tuvorebiberajir.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/juzavuwuvi.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/xanepodiwawuvoxex.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/92061567320.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/9f2fc6116f03df0cc4a304991f725495/vosapo.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/33155195495.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210926184653_342971959.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/morufefedokinaxuzisexodaj.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/pugojorikojanowalaxarop.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_off0000b0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90C 10744 bytes
SHA-256: dfdb62b59faa59371986748145e143820792b650443c04827075df0f569ba5e9
font_02_sfnt_off0000e185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE185 15484 bytes
SHA-256: 793c020612258f011f0faeb5de50b8243748d632a15151be5f666bb17e7f027e