Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3ce3a472f15da1e…

MALICIOUS

PDF

73.9 KB Created: 2021-09-21 17:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5a823837b4b487579167780793aab97c SHA-1: 56f4c0c7aac8dd17c9361daef2d7fab17b493d8d SHA-256: d3ce3a472f15da1ec6b736ab75a8d2fb524741588381dc8006f2d03f16884eb0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution scheme. The presence of external URIs and the 'link farm' heuristic indicate an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://huntic.ru/uplcv?utm_term=live+wallpaper+day+night+cycle PDF link annotation
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/tosadipumodaponisupibuko.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/90931743060.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/neleterejodives.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/8257409703.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/doviferawemepazomiridugib.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/zibonot.pdfIn PDF document text
    • https://tekartltd.com/upload/files/duzod.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/54518117316.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210903142747.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/famixotarawoto.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/4908359395.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/sesewusupivudo.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/kitirologen.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/62604870837.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/segokadoxawijozonoj.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/veredavewojulug.pdfIn PDF document text
    • https://websbag.com/uploads/files/lepafet.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/jogawoves.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/91064263141.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/nijozugajorafepe.pdfIn PDF document text
    • http://veitali.com/upload/files/kokazivafutisivaximav.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/72386877803.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/40452174364.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/guwamoxaxe.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210908092425.pdfIn PDF document text
    • http://skia22.ru/pic/file/41116540077.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_off0000bfbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFBB 10728 bytes
SHA-256: 67cb9b7b4ca525e7b728c9d56faa9c95832bd4f9053da2be6106bcdfb7b8705b
font_01_sfnt_off0000d825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD825 16204 bytes
SHA-256: e246d4a35b31d483c87829ba4638cb5410c213e0c5ed77fd9a231b74236e2fd2
font_02_sfnt_off000101af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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