Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ac145b2e3a2eb02…

MALICIOUS

PDF

78.9 KB Created: 2021-09-16 13:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 49b8b2efde3142581b19fcffa6f4332c SHA-1: 92db4fb4c4e8c28a0fea66bceb2b740b5c8b3f3d SHA-256: 3ac145b2e3a2eb0266295a9b8f041b95eb638e2a3e5a952f1242ec44ca9531aa
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. This script likely redirects the user to a network of external URLs, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous unknown-reputation URLs extracted. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://investbuild.ru/var/upload/file/forewatepifegoner.pdf In PDF document text
    • http://classiccar-jp.com/js/upload/files/64004983340.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/xajipoxasukepulo.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/85153828613.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/zasadanatokudoxub.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/getawiramavofosokor.pdfIn PDF document text
    • http://alptw.com/images/files/vaxutedusuvezowotasuminor.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161396f7d6983c---41931748307.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/46330391674.pdfIn PDF document text
    • http://watch62.ru/files/files/zituwofilugerupejuvik.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/likikumumoxoj.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/bujoxajemewusekabovorizu.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/jofaxomizonufiwegagam.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109141742523699.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/murafabidememomefubatev.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/57902231744.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/21314581201.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dagufukujerizilo.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/88041283649.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/gelidukisisopor.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/bb8ba8030fe55a42970d2fa57ff73551/75695644625.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/41540000364.pdfIn PDF document text
    • https://ms01bet.net/contents/files/debipumebenekavujosijix.pdfIn PDF document text
    • http://belv.ru/userfiles/file/wasifoka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=yu+gi+oh+duel+generation+apkPDF 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_off0000ce0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0D 10676 bytes
SHA-256: d9ebd3caf977aa3ed4a774be984554f2142b53b15ecf3069000b8175570122e8
font_01_sfnt_off0000e631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE631 18244 bytes
SHA-256: c07b04d2ad413376939435bd09af9637c6bea6eefd7fc5fb600cce3265e09866
font_02_sfnt_off00011623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11623 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1