Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddaec7d251aba63b…

MALICIOUS

PDF

86.3 KB Created: 2021-09-23 14:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3c6353f60e36a0c919486486aa582d69 SHA-1: 7595e294573fd5738c1f243fd7a769c077a7e767 SHA-256: ddaec7d251aba63b291bddf870b69694b2375045552b83c4f75152c4f3503102
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded links, many of which point to disposable hosting and are likely used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://wastran.ru/uplcv?utm_term=pokemon+ultra+sun+and+moon+download+apk+for+android PDF link annotation
    • https://hchoanglong.vn/userfiles/file/47394560667.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327f841a929---70185766699.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/jilinifexixutopunexodujak.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/kabuniwelutesudu.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/limaberabu.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/nelidavoredog.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/68019946166.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/30667837064.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/zetuzaxi.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/pewukimuruzulovodivajipu.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/pujakanimavisud.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/wopajezawamipilorus.pdfIn PDF document text
    • https://desco.scp.hr/files/81844694375.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/40441308329.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/22709138150.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/54628398257.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/50747623257.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/96856193722.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/48643024357.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/33248048744.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/37360690547.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/96853860646.pdfIn PDF document text
    • http://e-photosynthesis.org/userfiles/file/27892138294.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16144dd208b522---nilawovu.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_off0000e2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AA 10936 bytes
SHA-256: 6d4fbcc890cc3917a8fe369afcb9127c052a7065366008dd884e0e7f8a164828
font_01_sfnt_off0000fc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11428 21016 bytes
SHA-256: 58d77c02cfc77e12cf157dcddd182c67e8de9d4b0128d6e0b8cb26a63cb795db

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