Malicious PDF — malware analysis report

Static analysis result for SHA-256 3260c3a41f4affda…

MALICIOUS

PDF

71.0 KB Created: 2021-10-03 18:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c96319c18a224f573c8bddefdb958b6b SHA-1: 241999442604dde768d8b17e2a719ca378b96c8e SHA-256: 3260c3a41f4affda470bb53cf7074cb38b6f54a0f1e12a7d06ca41ba234f9657
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing campaign. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating a tactic to obscure the true destination or spread malicious links across many domains. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution attempt.

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 https://apelhijau.com/contents/files/84985526879.pdf In PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/jijifujudasokixamufupobi.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/gixejuterageteko.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/faporemetisinepamewepotox.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/fabudopowevigiweteb.pdfIn PDF document text
    • http://armanetti.com/images/33422027823.pdfIn PDF document text
    • http://dd-eng.com/files/files/15616903505.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613126f1bd3d3---zamazovijudepobovo.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/weputunaf.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/19258099269.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/setevabaxazukasavibuset.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/nuwodiviviselenejurasag.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/voxitejerixotokepalivaw.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/majanumerikogimebemizeb.pdfIn PDF document text
    • https://kiptep.ru/file/xodopupotibuta.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/sekorulopipufajam.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/poxirejobufedinemu.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/36751255164.pdfIn PDF document text
    • http://webs123.com/userfiles/file/silidoserujelu.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/winat.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/21408834194.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/xakunukojopifa.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/reroroxonitadewe.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/22347540521.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=wheel+of+fortune+movie+title+4+wordsPDF 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_off0000b311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB311 10780 bytes
SHA-256: 408a491a908d419d82665a892805dad371be94bf4e94e4a884e1f63c0f2d5c49
font_01_sfnt_off0000cbca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DC 15892 bytes
SHA-256: 2c84caf5242dc5ca791131a914236d6d64a55e860269017eaa8a7272681e03e3