Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6746b005d8bd678…

MALICIOUS

PDF

71.8 KB Created: 2021-09-27 12:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: afb6bf4c1511436056cb16efee549fc0 SHA-1: 0fa53ad104daf13cafeb20ded4c878293a203331 SHA-256: f6746b005d8bd6783c1a4ef5e4929dc88567eddeb5982f71a095696acab84309
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The sample also exhibits characteristics of a link farm, with numerous external URIs pointing to potentially malicious or disposable domains, suggesting a phishing or malware distribution campaign.

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 http://baozhaopharma.com/upload/files/99501584938.pdf In PDF document text
    • http://jycjqj.com/uploadfile/file///2021090407173457.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/53161102284.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-12/20210912024948101496.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/78311906915.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/2000380201.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/lesewuxovatupozamiwanowa.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021092513565250.pdfIn PDF document text
    • https://loyd.rs/images/file/kukuzukiwup.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/sokapusafisafom.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/wenanebom.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa13074d6a---dawonuvas.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/putimoramonejenoja.pdfIn PDF document text
    • https://etimes.mn/uploads/files/wivulufisapafanotowusik.pdfIn PDF document text
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/4846252672.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/53541112616.pdfIn PDF document text
    • http://mtt-association.fr/upload/file/71784786105.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/nofalafenolokezoxo.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/vetasemasefoduj.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cecece2e3d---32714645234.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/xuxozanatokefosisuj.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/zowekuxatujoravemikelug.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/50734172131.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/rikix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=screenshot+galaxy+s3+miniPDF 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_off0000b157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB157 11140 bytes
SHA-256: d72569d4ba4a280cba255daae158fe03d415f70d609f3a66ee2907af98b5b095
font_01_sfnt_off0000cb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB33 18084 bytes
SHA-256: 1d78bf246836c846fc939f922564b346d17c1e15f050ba6a041e71a811cdc697
font_02_sfnt_off0000f9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1