Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff2a76244562532f…

MALICIOUS

PDF

77.8 KB Created: 2021-09-17 12:38:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1b2ae269640f73715d3b97de38d4ade1 SHA-1: 0f5d6907e67b80c9a1f72ac542986da861a611cf SHA-256: ff2a76244562532ff2deea1f2bebebad4c2b6c0ce06b62cc75f487a85969c8f0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://synerhu.ru/uplcv?utm_term=rainbow+wallpaper+live PDF link annotation
    • http://bagiez.com/userfiles/file/75563748352.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613fac40138bb---kobemomulowez.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/ruxez.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/xapadiluxegalikofuwalizu.pdfIn PDF document text
    • https://davaocarrental.com/images/file/75982587243.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/gapubemixovof.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/80894656910.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/11681978598.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/59115583594.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/22368407319.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/71717400598.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/jozalimetenejosalusivu.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202192152278666.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/30882604259.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/14489875243.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/161404a5ee3c72---ragijejujov.pdfIn PDF document text
    • http://phuongsen.com/img-chamthi/files/nimula.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/57730497268.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/fevelazi.pdfIn PDF document text
    • http://friulanapanini.com/images/file/vexevuzes.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/4922701488.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/93108003039.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_off0000ca4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4B 10316 bytes
SHA-256: 8f2b2a4215ca4ed5a4261712a40a9029db38f1aec5d9d60997ba6e91893e1116
font_01_sfnt_off0000e16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16E 18780 bytes
SHA-256: 0a58d73d5724e8d3207d60bcb9095ab97d02532dba12d891539c7acd7ebb74c9
font_02_sfnt_off0001120c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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