Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccec528f0a99aba4…

MALICIOUS

PDF

84.3 KB Created: 2021-04-29 01:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f34703d1c3fe4626adcbc8a2fc186374 SHA-1: c9360a106b401463a32cdd370dfcd288c63dbf41 SHA-256: ccec528f0a99aba404bc9e04955dd3acafb9996d679bb548c7cbc27552779fa7
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to disposable domains, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains strings related to product replacement and application versions, suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=keurig+k60+filter+replacement In PDF document text
    • http://dobewobezusisof.iblogger.org/4266254267.pdfIn PDF document text
    • http://defumemijiwof.22web.org/vocal_remover_apk_full.pdfIn PDF document text
    • http://kavelokafozi.medianewsonline.com/romeo_and_juliet_act_2_notes.pdfIn PDF document text
    • http://dasezin.getenjoyment.net/95428426689.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376382/normal_5ff5ca5e37804.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486534/normal_602ada2a913bf.pdfIn PDF document text
    • http://nufivuzelikonax.getenjoyment.net/72953424112.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vewawisu.onlinewebshop.net/mcanisme_d_accouchement_normal.pdfIn PDF document text
    • http://pamanivu.epizy.com/built_with_science_upper_body.pdfIn PDF document text
    • http://xavemiwikujuxuk.rf.gd/excel_vlookup_using_worksheet_name.pdfIn PDF document text
    • http://xurorovesi.epizy.com/gpsc_class_1_2_2019_omr_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/18199823092.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/82035675640.pdfIn PDF document text
    • http://pisironebininuw.rf.gd/brigandine_ps1_android.pdfIn PDF document text
    • http://tesaminovosino.epizy.com/vibimufiwipoxig.pdfIn PDF document text
    • http://pejefovad.epizy.com/wadebuvilisaxu.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/72037843337.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85A 5484 bytes
SHA-256: b1e58d1b7d6c6ee557f89836b21281097f8339f61049a36adb407d012732ca1b
font_01_sfnt_off0000faf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF7 3152 bytes
SHA-256: d0d2cbb3c0be40a526c81c3f9c37f258e751b91624a59e3a93395cfb1e89724d
font_02_sfnt_off000107b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B5 11256 bytes
SHA-256: dc7112b5b09c37cf6fd7722d39cea4c466d0809239bc29c155a4f6b28c78bdf6
font_03_sfnt_off00012e19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E19 16180 bytes
SHA-256: 3b7f51f2a8a3d7a99fca661331bb0122e32b55677e585b996af61267a5bd7325