Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa68a602353b5e88…

MALICIOUS

PDF

82.6 KB Created: 2021-09-13 03:38:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1a93a4289623884535f0f520c67b4aaa SHA-1: fdedb1b3ce708d021000bc389ea735a4d818bd39 SHA-256: aa68a602353b5e88b9ca34bf8212278f52937b14bcfd10dbbf3baf8f93e3344e
154 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to execute malicious code and potentially download further payloads. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam, where the user is prompted to call a number. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://latrinquette.com/upload/editor/file/zumawugemefageluvijez.pdf In PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/24010677130.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/66925746885.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/xezofifefur.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/vudatufarevakosugevumama.pdfIn PDF document text
    • http://puisan.ru/uploads/file/43044798511.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/6326199697.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210907174324_OTU3OTU0MDA5OA==.pdfIn PDF document text
    • http://calisnt.com/uploads/files/71965488430.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/23884742761.pdfIn PDF document text
    • http://bwc.lt/i/16763016868.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/66505902654.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d632f11f80---98218083416.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/38989822968.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/gisatoxo.pdfIn PDF document text
    • http://momsystem.ru/public/file/87606315568.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210905055543732738dfxkvf.pdfIn PDF document text
    • https://bloomeng.com/uploads/14186574420.pdfIn PDF document text
    • https://arendic.cl/files/teregeni.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/tifelisubufavo.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/dowapuxexujuwit.pdfIn PDF document text
    • http://dhf-china.com/d/files/jikixexiroditojude.pdfIn PDF document text
    • http://dd-eng.com/files/files/zibuvokifemolupenazifes.pdfIn PDF document text
    • http://skupka23.ru/upload/m/74395493684.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=s10+vs+11+proPDF 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_off0000ddb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB9 18896 bytes
SHA-256: 6649442a82876573744f76e15cee85d92cf94a3dc531a83f4598551c98f11f0c
font_01_sfnt_off00010ee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE8 9928 bytes
SHA-256: f29579c2407f5ed8b3b55b9a014d197b05e1afa758d58cfbf54a572595d3033a
font_02_sfnt_off000124ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1