Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4cc34f8d640ac4a…

MALICIOUS

PDF

91.4 KB Created: 2021-09-13 11:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ec05a19db78c9c47744423ebef795b38 SHA-1: 7eaa6fd6dc72c369fe726a83121a2e053b56b404 SHA-256: f4cc34f8d640ac4a2ad43e8e86f6e3d2027d7acac917470c83e77d92afde56fd
82 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains or are part of a link farm designed to obscure the true destination. The ML classifier strongly indicated maliciousness, and the presence of JavaScript suggests an attempt to execute code or redirect the user to malicious content. The document body was unreadable, but the heuristics indicate a deceptive link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://newbusan.net/FileData/ckfinder/files/20210907_A2CC9F4738FF6BFB.pdf In PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be6b5663c8---49774931743.pdfIn PDF document text
    • http://africareview.in/userfiles/file/dalazipebevezigi.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/59967869949.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/11375849477.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/5349907458.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/94937663913.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/nopuxa.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/72414411215.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/lapunib.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/foduvomi.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/50465911927.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/mufufumor.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/748110883.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/23446588021.pdfIn PDF document text
    • http://hanauhrova.cz/files/60670083703.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/19503841055.pdfIn PDF document text
    • http://4yoga.by/pics/files/jatufepagawix.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/meniru.pdfIn PDF document text
    • http://landia-print.com/pdir/file/15517958962.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/88253154311.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1613bac695b093---josazupokazanuzatitedej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=yacine+tv+apk+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_off000101f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F4 17688 bytes
SHA-256: 1c8383541bd59a1a8764d105835a12854183b08ae6f4aab3641ac6d3e8aab81b
font_01_sfnt_off00013048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13048 10468 bytes
SHA-256: 8857cab9781b66a6c56f1e7210cbb0cfa477e17d2402dbe60a728f99b2d435e8
font_02_sfnt_off0001483a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1483A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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