Malicious PDF — malware analysis report

Static analysis result for SHA-256 387fd2cea4c2d91e…

MALICIOUS

PDF

80.2 KB Created: 2021-09-16 21:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dd117195731bca6153e034bbe6587767 SHA-1: e76ce7519939b468c8b7360acf4a73adebbf2b97 SHA-256: 387fd2cea4c2d91e0678168e720f9edfc38451bc8e1d23f84e66f322cd06fbff
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristic firings, particularly 'PDF_SEO_DISPOSABLE_LINK_FARM', suggest the document is designed as a link farm, pointing to numerous external URLs. These URLs are likely used for phishing or to distribute further malware, aligning with the Spearphishing Attachment technique.

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 https://queure.ru/uplcv?utm_term=can+you+play+minecraft+on+mobile+with+someone+on+pc PDF link annotation
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/befemuviguter.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/14568041333.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/varavikadifepiraxefo.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210908013440758286.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/41083461543.pdfIn PDF document text
    • https://titishop.co/upload/files/vimopasefakevazejo.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/20654358432.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/lunivemevabimilexowomuto.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/63044520122.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/36696211400.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/eb038ba433970bb9e1d0d3469c338be4.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/zedodawozixekonaseno.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/81985361378.pdfIn PDF document text
    • https://duel.pl/userfiles/file/10889800282.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/fofofe.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/vitexaredevazul.pdfIn PDF document text
    • https://kenadong.com/contents/files/37055055451.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/39097016533.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ubg2env8ufn22pjee0mkr06eh3/tatevexerokuta.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/c23ba9d240d000785a1094c7db767309/56612526340.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/37848459715.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/67181282301.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_off0000d3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEE 11216 bytes
SHA-256: e7c382cf72951e5de882e2ebdf54abe63a3e65301d1269d248efa5acf9adb2af
font_02_sfnt_off000105dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DD 17704 bytes
SHA-256: bc0cca517076fdffd16c6a6fcc8bc36fb15c23743f8762ec7f25bc3ef3876c1a

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