Malicious PDF — malware analysis report

Static analysis result for SHA-256 c565d949b7303b91…

MALICIOUS

PDF

73.2 KB Created: 2021-09-23 02:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d0cb4704b72ae3c113a5ec4e9935c365 SHA-1: 72d0143fc2917016bab33aefd0adccf31fbb60d9 SHA-256: c565d949b7303b91f2ab77849d01af3c53d9f7cdc11424f3a8270212347d3d91
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the large number of extracted URLs indicate a strong intent to direct users to external, potentially malicious, domains. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://cructi.ru/uplcv?utm_term=dice+throne+adventures+rules+pdf PDF link annotation
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/87071381953.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/20971610180.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/faxosuwujefurodi.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/xuponedisutipokar.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/57309032898.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/22345221884.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/14107894048.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210918041428.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/7029469760.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/kajuwuzenalek.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/segaxuluzi.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/xokirajifema.pdfIn PDF document text
    • https://mots.alaxarxa.cat/cmsimple/images/file/mixegafuligokowen.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/1076545571.pdfIn PDF document text
    • https://izr.fr/files/41242883213.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/16839337082.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/46431243328.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/pimudef.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/3134991267.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/tujudujofunuxeras.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/duzikovuxodokowujoj.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/93466567716.pdfIn PDF document text
    • https://trexanh.net/upload/files/15107082424.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/m0frm7ns4i671pkqo3kfag27ai/46093993921.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_off0000bcf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF5 10884 bytes
SHA-256: 65ab13b2346937bc6a85ba69c2874dc91a2c983c99758ced876367ab36161527
font_01_sfnt_off0000d620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD620 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE32 15960 bytes
SHA-256: a87757784b9c5724b3280eb2e10200bf5ff44ef1beafd2996dd1ba58b9298a52