Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd832f9d50f48c87…

MALICIOUS

PDF

69.1 KB Created: 2021-09-21 20:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1b17063a715b91cf00bbd20dd98696d3 SHA-1: 312195f3c03309df1968d6c055f94483b6b70f7b SHA-256: cd832f9d50f48c87c2818611a848e1592f55d9faef120948888d6b705b3d794c
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of embedded JavaScript points to an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://huntic.ru/uplcv?utm_term=update+app+on+firestick PDF link annotation
    • http://2990592.ru/ckfinder/userfiles/files/38449457754.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/sepobefubobelunuratako.pdfIn PDF document text
    • https://marbletreasures.com/uploads/image/files/50230163809.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/42189173946.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109110135016136.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/jezekupabesa.pdfIn PDF document text
    • http://gpshardorawal.com/hemkunt/userfiles/file/37815569206.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/53209806493.pdfIn PDF document text
    • http://kechengchem.com/upload/files/90880575314.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613667c110c39---76230436059.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/96629808076.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/157648904.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/gukezafiwowokevag.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/xunitovulisod.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/xigawidatudagevonubupix.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/puroj.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/kurifuweligi.pdfIn PDF document text
    • http://exosushi.com/uploads/files/64022402130.pdfIn PDF document text
    • https://vietnamwelder.vn/uploads/news_file/memuveroxazufigu.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/7154458278.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/68490739197.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/61903866818.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/bafakakejuxiteje.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613222f593763---26039262279.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/zusawuzapuva.pdfIn PDF document text
    • 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_off0000b2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAEB 14360 bytes
SHA-256: 6ff9a3415b09e7c792d0b97080b8549247f53a3f40099d6f808c1e5d804eaade
font_02_sfnt_off0000eeab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAB 10668 bytes
SHA-256: 1d7fa25a6895a4218842ad9cf8f78ab2d1a97422ddc19c0ab8deca1e5b4289b2