Malicious PDF — malware analysis report

Static analysis result for SHA-256 49b241ec30ae077e…

MALICIOUS

PDF

70.7 KB Created: 2021-09-28 16:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 047d9d22f007e9c02a7faea7df8ecf6d SHA-1: bdf38c62ebb7cb563904806d336a9269cf61b23a SHA-256: 49b241ec30ae077eaa42c4bc5fec630455bfb0b1a24dcc25681ee99a41b3d4a6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was flagged by multiple heuristics, including a machine learning classifier and ClamAV, as malicious. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, further supporting a malicious intent.

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://krisoc.ru/uplcv?utm_term=anatomy+and+physiology+book+for+bsc+nursing+pdf PDF link annotation
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/25609838149.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/xazuxasagetovagugibipob.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/vuzipowaxajogimowokegiwip.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/84094999991.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/ravizo.pdfIn PDF document text
    • http://www.polni.si/Images/files/7073225490.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614f89dbce6da---56309683450.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210906020849.pdfIn PDF document text
    • http://mar3ol.com/Files/files/mixozalaripibiwakoz.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/nuvib.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/75114857873.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/71377637093.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/kixumiviwefo.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/75713623207.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/6212877034.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/82161544728.pdfIn PDF document text
    • http://recviem.ru/img/upload/gakisixigizudomo.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/14064653299.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/6140762879320.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/56012544731.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/lopajenivilelobesibitor.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/fadonopividoropebob.pdfIn PDF document text
    • http://langmypham.com/luutru/files/88900865783.pdfIn PDF document text
    • https://maria-galland.ru/files/file/visitu.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_off0000b2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A9 15668 bytes
SHA-256: 6926b5f4c55ca3e5aec57b39993178974d6ac19028fce959718bf20409e89fbd
font_01_sfnt_off0000da67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA67 11364 bytes
SHA-256: 1b7ee7a08b229643470f384f365ff241893e7ad07ef3260986f0191dedc112fb
font_02_sfnt_off0000f49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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