Malicious PDF — malware analysis report

Static analysis result for SHA-256 c70e23af5e383cd6…

MALICIOUS

PDF

118.1 KB Created: 2021-09-21 03:20:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3f6ce08cf3514739f761e4fdc2f35d48 SHA-1: df6803acdaa461beb5c11109003be14c26715d03 SHA-256: c70e23af5e383cd690cb6d85023a3b945add1014027e86a537dafd97e2636671
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm and a lure to install browser extensions or updates, a common social engineering tactic. While no scripts were explicitly extracted, the PDF format can embed JavaScript, which could be used to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://worldsocialistpartyindia.org/ckfinder/userfiles/files/gamosepurivadesonud.pdf In PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/rawajudemot.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cee8e95a73---80476308372.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/fodolazate.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/84559910328.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/66991894258.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/suxepelavosososab.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/repujuwubexu.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/2538346710.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/kasuwajudag.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/mr7gt0a1is4r7f4cn6ug8lk8d1/zowumomotixuxakepajaje.pdfIn PDF document text
    • http://elitk.ru/_files/72424069500.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/41908086468.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210903044309.pdfIn PDF document text
    • https://susta.vn/userfiles/file/pekejirufufipixosopefup.pdfIn PDF document text
    • https://sergiomauri.com/images/file/dilubikebadalum.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/domet.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/16673176813.pdfIn PDF document text
    • http://northcity.rs/slike/files/42201517706.pdfIn PDF document text
    • http://archbot.pl/files/file/6901253402.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/nuzujij.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/fuvoko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=samsung+a10+custom+romPDF 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_off00016087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16087 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17899 21536 bytes
SHA-256: 8d2e7584c96cfbff08bf1786bbdba389095e666552705eb12ac71efceab0d5ff
font_02_sfnt_off0001b25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B25A 10652 bytes
SHA-256: 191d7b578ee9caed3219dd89b3abc71c9fdfe156aaf87196e55c370422a98066