Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf425da4049bf7b…

MALICIOUS

PDF

75.4 KB Created: 2021-02-17 21:37:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ed6bdc16034bad68877578c1934aeab SHA-1: 42b2052e56aa628db8574266fdbb44255ca02428 SHA-256: 5bf425da4049bf7b0daebd908115a9de397ce2cf944ed8e9bf0a3490ec4a2391
136 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and ClamAV detection strongly indicate maliciousness. The heuristic 'SE_CLIPBOARD_COMMAND_LURE' suggests the document instructs the user to paste content into a command-line interface, a common tactic for executing malicious commands. The embedded URL points to a suspicious domain, likely serving as a download source for a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://jacksth.ru/wix?keyword=step+2+mailbox+installation
    • http://ultra0.space/repevobosaluxaxuj4dwbb.pdf
    • https://cdn-cms.f-static.net/uploads/4457006/normal_6019730482cad.pdf
    • http://ru-en.xyz/django_model_to_dict_templatesl7rz.pdf
    • http://podeves.xyz/sky_force_game_2004urxr9.pdf
    • https://static.s123-cdn-static.com/uploads/4459185/normal_5feb9269b63bb.pdf
    • https://cdn-cms.f-static.net/uploads/4404515/normal_601095b21029e.pdf
    • http://iblack.space/fancy_text_cool_font_generator_apke7yi4.pdf
    • http://unosital.space/1487922480jzs0i.pdf
    • http://latencfsrt.space/82440879672sljrn.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://milodip.epizy.com/29221352748.pdf
    • http://bikufupok.rf.gd/diablo_2_rune_hunting_guide_1._13.pdf
    • https://s3.amazonaws.com/mojivikapeti/platform_shoes_white_cheap.pdf
    • http://sofidubanelen.epizy.com/67104138282.pdf
    • https://s3.amazonaws.com/tidigudetefumof/wood_cad_cam_software_free.pdf
    • http://xutakubu.epizy.com/16736951839.pdf
    • https://s3.amazonaws.com/novifamigot/bossy_verbs_worksheet_ks2.pdf
    • https://s3.amazonaws.com/lukepepe/adzan_merdu_bikin_nangis.pdf
    • http://gowasofejav.rf.gd/22264252737.pdf
    • https://s3.amazonaws.com/pevuwarobuvowa/free_guide_book_new_york_city.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_off0000eaf1.bin
7770534cccc0a95d175429fc73e5944a2d5d91db518e11751f340edb1acd644f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF1 5312 bytes
font_01_sfnt_off0000fcf1.bin
eed1de62389cf8eacda44d6e7795e779d8f96ed866f589845f08324a525dc3ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF1 10276 bytes

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