Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b9ac3d614097085…

MALICIOUS

PDF

80.3 KB Created: 2021-09-18 07:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d9083d263dbf06bf287fa706cc110f37 SHA-1: c4c3d6e8c59f400e6442a10447e68f6b8bc0b9e6 SHA-256: 4b9ac3d614097085db4f9b1940d8a826e99b08c3870b822985ff2434f1e0f665
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links to external sites, some of which are algorithmically generated and hosted on disposable domains. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly indicates maliciousness. The embedded JavaScript and external links suggest an attempt to download a second-stage payload or redirect the user to a malicious site.

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://g-shocktou.com/user_file/file/83104277918.pdf In PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-04/2109041228039549918vkggy23j4oy.pdfIn PDF document text
    • http://zzweien.com/d/files/11502518543.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16145021f22f94---35154141291.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/gesepebegasunogaged.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/visawaze.pdfIn PDF document text
    • http://meta-min.com/files/10432785941.pdfIn PDF document text
    • http://thegioioto.store/upload/files/zulejegi.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/gijizirapeg.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/66878887594.pdfIn PDF document text
    • http://precisao.net/files/files/satimusomelusefurubagubo.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/virinesituputabifir.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161373b2562cd1---vuzenubebenitoruliladebik.pdfIn PDF document text
    • http://feminella.ro/upload/fck/3339700055.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/0fsuh37a12nncjvdcfd27bfer7/74630582167.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/49711633086.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/46431111394.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/77238185571.pdfIn PDF document text
    • http://efckrakow.pl/userfiles/file/zadobetepopufu.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/pogiwukexulo.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/73868766439.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/rovire.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/76011489911.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/nedinibunupotoropajavo.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/31743648222.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=mp4+to+mp3+convertorPDF 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_off0000d434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD434 18452 bytes
SHA-256: 67c85417c48b4ab693b6b63e724a3dac31a24d7e2ef361a85d12ce7acc11c5be
font_01_sfnt_off000103c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C7 10376 bytes
SHA-256: 4cae15c20c8fb2eda949b064ba11499686b9f1b4f2c58599f911ba13cddad244
font_02_sfnt_off00011b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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