Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dadcfcfa689ae94…

MALICIOUS

PDF

84.6 KB Created: 2021-09-18 18:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2aabaf5d43c1928f8ee863ea9f31bbcd SHA-1: 083d9328d157b2648bd8d2649b00d07b120fac52 SHA-256: 5dadcfcfa689ae9410e9df62cecedb4b4ff37e95ef05312580e2668be5b0471b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to disposable domains, indicative of a phishing or malware distribution campaign. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggests a malicious intent to host or redirect to malicious content. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://pistant.ru/uplcv?utm_term=solid+explorer+android+11 PDF link annotation
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132795e451a1---rubetufapogu.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/30255789676.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/93230471526.pdfIn PDF document text
    • http://zeci.nl/im/image/fuwinumunitisirejasowexu.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210901220827.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/48898662022.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/zovani.pdfIn PDF document text
    • http://contextuae.com/resimler/files/64369475329.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/31071884795.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/69221360747.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/miredesufeposewimenap.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/ragafofibirurifelixub.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/30163981728.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/11304183558.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/90457779743.pdfIn PDF document text
    • http://temple.mo/userfiles/file/77513293083.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/98171828843.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/kotefok.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/xawokogasotoluz.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/watibevetasazero.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/zunenakivukokoxir.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/kekeg.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///29949432374.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_off0000e643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE643 18392 bytes
SHA-256: ef61813d95ac1efc5960a4fd6ea917a2faf6aafddbbb2ceeaf19d8c29a712375
font_01_sfnt_off000115d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DEC 10348 bytes
SHA-256: 9b68552427dbdffc793f72ddf33806be517d4ea4ddc752e8fea0f822835c93c3

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