Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8dd6c551f732a6…

MALICIOUS

PDF

83.5 KB Created: 2021-09-13 13:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b37d16e4d67a1e790917e407d985c935 SHA-1: 00d6326721c41b740009a9e73587d50a658a6d15 SHA-256: 4d8dd6c551f732a65af05fa1aaf61567c7e4472d58f4c9032d2db8cce240b25d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript 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 embedded JavaScript likely redirects to one of the numerous external URLs found, which are often used in phishing campaigns or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://alkalacarservice.com/public_html/userfiles/file/mivepi.pdf In PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161324b651eadd---63199676151.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210909021256.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/bividusej.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/2089276725612f3289aae7f.pdfIn PDF document text
    • http://wenyanchem.com/upload/files/87447364487.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/64522019292.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/46711106205.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/72716959654.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/ruzubelumazemidiwelo.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/vodulepefibufawo.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/80956289897.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/93595605852.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/dujalitiladeduv.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1631469045.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/vosenejuto.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/22698014124.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/muwoluteno.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/99552786865.pdfIn PDF document text
    • https://lombardpruszkow.pl/local/userfiles/file/bezulivagusonofukovaze.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/68878480361.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/kuliparinopunuwusilabixax.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/besegutub.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/50451567364.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/44437554514.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=desert+seed+minecraft+xbox+onePDF 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_off0000e254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE254 17208 bytes
SHA-256: f8ce9c22977aa92903f803c9c34e2fed6c3953a96d2675c51cdac9bc4ffd3ee2
font_01_sfnt_off00010f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001271b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1271B 10832 bytes
SHA-256: e0867b974b897e3dcd80adecb91a916c319bda1d5137241eba5ac245019c5d3b