Malicious PDF — malware analysis report

Static analysis result for SHA-256 81e7c274f51188f5…

MALICIOUS

PDF

92.2 KB Created: 2021-05-17 05:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20098170bc1bedd46c3e11413f77d3d2 SHA-1: 71fe0481f55cf8a78594540ccd045e3fe08c49ad SHA-256: 81e7c274f51188f5a5637a3d273ca3005e998cb9b2c29e6448c19a3dfa046895
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL, identified as malicious by heuristics and a machine learning classifier. The document body, though heavily obfuscated, suggests a lure related to a 'user guide'. The primary IOC is the external URI pointing to a suspicious domain, likely intended to deliver a secondary payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/strik?utm_term=jbl+eon+615+user+guide
    • https://cdn-cms.f-static.net/uploads/4443576/normal_605455ce43dd2.pdf
    • https://cdn.sqhk.co/gabironero/digif8b/scumm_games_android.pdf
    • https://cdn-cms.f-static.net/uploads/4367646/normal_60500e4a271ef.pdf
    • https://tebobasuzojipol.weebly.com/uploads/1/3/1/4/131407082/nonepax.pdf
    • https://ginadilu.weebly.com/uploads/1/3/4/7/134768391/9c5eeb06.pdf
    • http://pozonewexoz.iblogger.org/how_to_unclog_my_dirt_devil_vacuum.pdf
    • https://ribugasa.weebly.com/uploads/1/3/6/0/136053023/2c24a0.pdf
    • https://vufosaxirit.weebly.com/uploads/1/3/4/0/134018891/dokawe.pdf
    • https://static.s123-cdn-static.com/uploads/4463279/normal_5fce8614a7767.pdf
    • https://cdn.sqhk.co/zubuwebofe/h6LjEhd/81822724509.pdf
    • https://cdn-cms.f-static.net/uploads/4459318/normal_6035d202ec9ac.pdf
    • http://piwosiberogam.iblogger.org/fusionner_avec_acrobat.pdf
    • https://cdn.sqhk.co/purorelaz/ggPgiii/91563039000.pdf
    • http://dofagagisefukiv.22web.org/walmart_new_hours_el_paso.pdf
    • https://cdn.sqhk.co/nedupugifuka/ZRA7ckc/multiplayer_escape_room_games_ps4.pdf
    • https://cdn-cms.f-static.net/uploads/4386081/normal_606c9b92c966e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kivudul.rf.gd/nekuzo.pdf
    • http://tuxolemoga.epizy.com/83533747335.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000128e2.bin
dc3fcb81bd16ad4989c7906f2b80605252b183842754854cda5e40df8e3df516		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128E2 5240 bytes
font_01_sfnt_off00013ac7.bin
19b2b741040252686df1bfa384a9c4f1fbee313a790d539f5ee5fcfbf284f59b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC7 12904 bytes

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