Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce45531c34c4ec08…

MALICIOUS

PDF

81.7 KB Created: 2021-09-10 03:25:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f2679ed051a8f88707840ef21eeb79c2 SHA-1: 826d715731cffc32678501bbe1e714ad5b23791e SHA-256: ce45531c34c4ec08420299a7eec325b181cfd28e2049424c295b7f92b4946ba4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting an attempt to obscure malicious destinations or engage in link farming. The embedded URLs, despite some being marked benign, are part of a larger pattern of suspicious link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://neurooperations.com/ckfinder/userfiles/files/jojinotamivobuwegudeg.pdf In PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/60565877032.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/14510689970.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/gerepiwiziwerofuvozinib.pdfIn PDF document text
    • https://vietnamwelder.vn/uploads/news_file/14512700392.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/55792683531.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/i79u1d5l1i0g8a49cmphnc0h6i/52655678602.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/8312346288.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/4910503837.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/jufadexokov.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/vupesefulavukedezata.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/sovarapunimatedewabit.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/87960585404.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/forowatogi.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/15936703663.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109010730588224.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/tilonelemuboviva.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/sipobem.pdfIn PDF document text
    • http://prograsifkalip.com/files/51025899070.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/20343361991.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/jeminitorawave.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/97450496457.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130dc359e77f---38839860355.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/jituvekelu.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/matetasifotosum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=does+apple+watch+work+with+androidPDF 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_off0000dcb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB4 16776 bytes
SHA-256: 70dc88d18990b58e0aecea5b237f3ec205fecdcc166c40dc0bd349ddc5ee3ecd
font_01_sfnt_off0001082b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082B 10792 bytes
SHA-256: 5d9e1fde809c1db5dbadb0cdea6e9e1194d0f5bfe621941cd0121573322ef729
font_02_sfnt_off00012112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12112 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1