Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cd8c01b56185f37…

MALICIOUS

PDF

96.0 KB Created: 2021-04-02 01:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f2796d8d57b00c2c2e953edb80d1493 SHA-1: 538a93c4f84fb3e8e889c48aa1b4c637ccf814c1 SHA-256: 9cd8c01b56185f37bfd98e43bc86903e5cf821e746b020d085899f2eeb572b4a
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a specific detection name indicating phishing and trojan characteristics. The embedded URL points to a domain associated with potentially malicious content, disguised as a free book download. Although no scripts were explicitly extracted, the PDF structure and the nature of the embedded URL suggest an attempt to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/award?keyword=libros+de+benedicto+xvi+pdf+gratis
    • https://static.s123-cdn-static.com/uploads/4445890/normal_5fccef67013df.pdf
    • https://cdn-cms.f-static.net/uploads/4366341/normal_602611f3940b1.pdf
    • http://taforojujutusig.mygamesonline.org/tlc_entre_colombia_y_estados_unidos.pdf
    • http://kulofokugizadeb.22web.org/cash_flow_forecasts_template.pdf
    • http://riniwovefaraw.22web.org/how_to_indent_text_in_google_sheets.pdf
    • http://nubuxeki.scienceontheweb.net/300_graphic_novel_free_download.pdf
    • https://cdn-cms.f-static.net/uploads/4382631/normal_5fdb1021a9b9c.pdf
    • http://crubr.space/accounting_principles_13thct7vx.pdf
    • http://wisitens.online/697886775087r9on.pdf
    • http://fb-ig-copyright.com/roku_stick_remote_for_saletdimb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e60c805d-b9e1-47fc-b045-983511e9ac1f.filesusr.com/ugd/116bb2_539efa74b8844d7ab154a64daef85d59.pdf?index=true
    • http://lemuguta.rf.gd/palm_astrology_in_tamil.pdf
    • http://duzijomitopaxa.epizy.com/ignou_b._ed_syllabus.pdf
    • https://5d94d51b-2702-4b64-8df3-eadd022f3edc.filesusr.com/ugd/2ddd39_f2ebbf9e5efa4e23b332b9c041dcd350.pdf?index=true
    • https://1423d76f-a56f-4481-bf87-726e17039346.filesusr.com/ugd/14aee2_ebf4c7d2c4e840dea0ca0cd9763a8fed.pdf?index=true
    • https://uploads.strikinglycdn.com/files/489ec73d-66fc-47a3-8e22-b56dac2ce7bf/how_to_test_a_bad_diode.pdf
    • https://uploads.strikinglycdn.com/files/aef3c319-fde0-4d46-801b-6b92b997ca44/lalifanonam.pdf
    • http://nusonakogip.epizy.com/11505600862.pdf
    • http://kubowulurarekij.myartsonline.com/48771417242.pdf
    • https://8ca15cf9-c5bf-4329-906a-32df3c7b5ab7.filesusr.com/ugd/4ca7f5_3bc48d0092bb48df9626a6ac87282dfc.pdf?index=true
    • https://f3b8d348-8566-49c9-a9f8-a2c3b9e1bc8e.filesusr.com/ugd/f1c748_d1634b1c18d74fd4ab06ec24b361a156.pdf?index=true
    • https://uploads.strikinglycdn.com/files/23409f5f-d31d-42a0-bea8-6b642ca78c49/30971912180.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_off00013466.bin
74780b018e543a009e98e23c735142b7be8f303fe139ec9aa9b4181399ef3d4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13466 5500 bytes
font_01_sfnt_off00014731.bin
76628cf62793ae5b3517b2bdf6d5edbb3c0660aaff6508d257439cff8888a0d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14731 13788 bytes

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