Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1ea81a40f1c94f7…

MALICIOUS

PDF

69.6 KB Created: 2021-09-20 21:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: af2a8385952cf2f5ee2aac1425977123 SHA-1: a4bba7ae42c258acec491780baf92d8b8604e31d SHA-256: a1ea81a40f1c94f7c8bd96b39bf9179d615e2a56918319d082941a94245ef25a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript points to T1059.007, and the nature of the file suggests it was likely delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://extrastyle.ee/ckfinder/userfiles/files/64231189489.pdf In PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/63949667595.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/godigesugojidedenepuv.pdfIn PDF document text
    • https://iwistw.com/upload/files/fotibapemupopunimoripo.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/tibebopezozifixad.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/vikaposejafodefodug.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/93260084232.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/5452312766.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161464cb389006---vujemo.pdfIn PDF document text
    • http://gymostrov.eu/gymostrov/userfiles/file/86150309314.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/nirabexogimo.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/52014077151.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/35242393013.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/zusaka.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1614267c2bfc73---rarasojofapejanul.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/wevudefonixafag.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/baselovavuvu.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/348690016131269c04391.pdfIn PDF document text
    • https://villadelauca.com/userfiles/file/2230200931.pdfIn PDF document text
    • http://modero.vn/upload/files/lewegusebisotokatefopeve.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/39141411750.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/wujapozolipizakikivi.pdfIn PDF document text
    • http://kmsenior.org/file/files/muxisizunika.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=coc+hack+apk+download+unlimited+troopsPDF 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_off0000afeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFEB 15276 bytes
SHA-256: d3a1771887e67aee6d50ca64d13d68a6d2856960d2fb7ca93aa4e477ab895661
font_01_sfnt_off0000d6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED3 11088 bytes
SHA-256: 66b02f933bf9ea3f22e7c3a4022c3febab9896f2c819a1e8d098acbb4cbdbcf7

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