Malicious PDF — malware analysis report

Static analysis result for SHA-256 933a4f38e6c9b297…

MALICIOUS

PDF

99.5 KB Created: 2021-09-20 15:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 404627f3c519ee39ad40bc47f1286247 SHA-1: 52549ee7b42b131083da39be4de8ab3148342fd1 SHA-256: 933a4f38e6c9b29722b1ca5bdc6ecee112823f86efc6cdabca8e2138ff18e455
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to a link farm, a common tactic for phishing or distributing malware. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic specifically flags this behavior. While no scripts were directly extracted, the nature of the embedded URLs and the ML classifier's high confidence suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://hanmih.com/userfiles/file/20210912042418.pdf In PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/25395480418.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/76061457289.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/nemakibedezi.pdfIn PDF document text
    • http://poultech.net/d/files/topejuwalerofavudiget.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/dogem.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/gedibidirojiberevob.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/wumevof.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/85885853160.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/4l5hugi5e0g73gafh2kt794rtu/zezosomafe.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/risukifa.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/merepawavupaxitid.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/33813569694.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/79803740513.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/94963402896.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/jewamujoxasawodojijilevov.pdfIn PDF document text
    • http://edituj.cz/res/file/93958937051.pdfIn PDF document text
    • https://quangtriasianwindow.com/uploads/image/files/87203373497.pdfIn PDF document text
    • https://coil.hk/upload/files/fuxinizanefogifarafoz.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/tususimufuxadefavafaxekin.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/ed31c601bf993543c3590b07f9c41f8e/99225697012.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/10522677272.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=fall+guys+early+access+androidPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/23471097550.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_off00011bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13415 10640 bytes
SHA-256: 314308e48d5a81cd776186296953463c115e4c189dd65f24b21d3d126dd98c4a
font_02_sfnt_off00014c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C50 19684 bytes
SHA-256: 8ba5990e55b81f80e47f3c2a8b0358e021f865bb37bc03e9f90844bd4d6b8e5d