Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d6551ec5efb202…

MALICIOUS

PDF

69.5 KB Created: 2021-09-12 22:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 87b813229e29fc7f8407235341dc7353 SHA-1: c77727f118510a36dae2b1addecd9f57584468ee SHA-256: f8d6551ec5efb202bad7cb0353b794cbf3028553a7c087c9db934385e8a89d81
154 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and is flagged as a phishing lure due to its small size and image-only content, typical of a screenshot used to hide clickable malicious links. The document's structure and numerous external URIs suggest it functions as a link farm, likely directing users to malicious websites for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://ajtoablakcentrum.com/_user/file/87978946036.pdf In PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/zomebavasimezalelexuduwe.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/3493014348.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/42882845151.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/33557956748.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/medijaludikebajaropos.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/80053208355.pdfIn PDF document text
    • http://www.bash.cl/media/file/vukipanupase.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/36560598108.pdfIn PDF document text
    • http://kahsport.cz/userfiles/file/walogugususobupuperinumo.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/9628195962968cb5a53e27d4697eabbb.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/57981559385.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-7/20210907052415595142.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/timotasolizejipav.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///2499132954.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/54711419844.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/wadubudewoxeviwurisideton.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/tisuzomiwofifirob.pdfIn PDF document text
    • http://wawa757.com/uploads/files/bofazemerosa.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/29851116218.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/28157951894.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/43761453406.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/30020212075.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/puduxotukixanugopoxonodu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=android+kunjappan+ver+5.25+movie+downloadPDF 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_off0000b33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB33C 11060 bytes
SHA-256: e583f4acfa4768197f1c8ea0572e1e249bd52958110355a129f886e3bbdce5b5
font_01_sfnt_off0000cd06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE518 14060 bytes
SHA-256: afa4460a43bbb2c9e773ec5089d208b930b016cb2014688fcd62bde561acd2d3