Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb97aab27f601b78…

MALICIOUS

PDF

77.0 KB Created: 2021-03-27 21:12:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: db155d47de0e564caafb446a0f0b1729 SHA-1: 356f7ca8e2cca62175aa49bf79bad74e791eca37 SHA-256: cb97aab27f601b789ae0b9677afc4fda33c8a338400ff38aaa75d7688610403f
194 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and it contains a critical heuristic firing for a malicious redirector link. The embedded link, 'https://dafemum.ru/award?keyword=corporation+bank+net+banking+form+pdf', suggests a phishing lure related to banking forms. The SE_MFA_LURE heuristic further indicates an attempt to harvest credentials or session tokens by mimicking MFA prompts. While no scripts were explicitly extracted, the PDF structure and malicious link strongly imply an exploitation attempt to redirect the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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/award?keyword=corporation+bank+net+banking+form+pdf In PDF document text
    • http://afracheat3.xyz/42077422746jex7q.pdfIn PDF document text
    • http://presalon.xyz/first_angle_projection_drawing7mk9v.pdfIn PDF document text
    • https://cdn.sqhk.co/disegivoji/ge8IOhe/marketing_assistant_jobs_in_atlanta.pdfIn PDF document text
    • http://muzoc.xyz/introduction_to_software_testing_coursera_answerskarhw.pdfIn PDF document text
    • http://vnds-super.space/trench_warfare_in_world_war_23caxb.pdfIn PDF document text
    • http://pressit.fun/detailed_design_report_definitioncx6qm.pdfIn PDF document text
    • http://ovca.space/98433809576ufeeg.pdfIn PDF document text
    • http://shishkin-seed.xyz/the_maker_eye_meaning_in_tamilt2drf.pdfIn PDF document text
    • http://lnstagram-help-businesss.com/sC4B1vC4B1larC4B1n_basC4B1nC3A7_kuvveti7oyob.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/ijyjaij/miwofimeredukebuv.pdfIn PDF document text
    • http://dkblogin-de.com/20616767737p3m25.pdfIn PDF document text
    • http://bluetea.space/14103311700pw2jb.pdfIn PDF document text
    • http://kyrgyztours.com/how_to_use_a_bed_sheet_to_make_a_togahj8av.pdfIn PDF document text
    • http://trendmobile.ru/call_of_mini_zombies_ios_hack_no_jailbreakyvv4j.pdfIn PDF document text
    • http://airet.space/jozotirilaguxewatitubaneh7hz9.pdfIn PDF document text
    • http://cardioactiveitalia.site/ryobi_leaf_blower_40vplb3w.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bexolamabad/12179955956.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/human_computer_interaction_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/film_habibie_ainun_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/android_studio_react_native_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/android_studio_apk_export.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF00 5260 bytes
SHA-256: 006980a3bf82dcd08395237cc6b85d1f48d62b8484b09264b782156d3d4d73bd
font_01_sfnt_off000100ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CA 11072 bytes
SHA-256: e50f36ebb36d2ebdea4f096a6ec574dfaacc53f0832ccb4a6cfc9f44b3f2fb8b

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