Malicious PDF — malware analysis report

Static analysis result for SHA-256 454d198d4160316f…

MALICIOUS

PDF

79.3 KB Created: 2021-09-11 07:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 17506321a2a062a878166afae5ef546c SHA-1: 519b95850972a95d9c2135d3505574f6f1e1bb22 SHA-256: 454d198d4160316f349be28a1164af9c872abc90b05d4f621fca8c3f63ec7400
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The PDF structure and the presence of external URIs indicate an attempt to redirect users to potentially harmful websites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://brenno-tojestto.pl/userfiles/file/xisosifara.pdf In PDF document text
    • https://eslms.com/userfiles/file/pifapomesigavuvigiwo.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/78570526254.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/42764405269.pdfIn PDF document text
    • https://adikmanis.com/contents/files/dosexobalaguxixenizemutev.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/25213197747.pdfIn PDF document text
    • https://schmitz.cz/res/file/78755749990.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/83103508426.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/59044342860.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/vagakiwuwusutujidotegu.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/3384111476.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/27554769058.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/39295187751.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f49dce1f7a---mulunojimofodepafuxowu.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/gutupatudozojezutixuxo.pdfIn PDF document text
    • http://apcmagon.com/userfiles/67017370071.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/65246625601.pdfIn PDF document text
    • https://websbag.com/uploads/files/93972940679.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/jezex.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/burebanibodet.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/fizobajemipabobapikoxekek.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/21932400710.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=god+of+war+iii+ppssppPDF 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_off0000d4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B5 10236 bytes
SHA-256: 27acbae583a395fe0f4a0d4589f2ba901a1cb473157ab187d84e4362cd7cbe0a
font_01_sfnt_off0000ebe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F2 17092 bytes
SHA-256: 15532de61ffbe7d9bdf2d8e209b96025c49d47b2822a7c56b2a43470e3edd75f

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