Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f43d21c57374dc4…

MALICIOUS

PDF

88.1 KB Created: 2021-03-14 04:56:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 5656c9e7738d733aab12ce08cf5642a6 SHA-1: 8b994af0d0f35b050aa505e530d31cb022082ea6 SHA-256: 3f43d21c57374dc46738b82906c89dcc98bed6f61f8a5ab860423a51f41ff2d5
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. ClamAV also detected it as 'Pdf.Phishing.Trojan'. The embedded URLs suggest an attempt to redirect users to phishing sites or download further malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://ponafet.ru/award?keyword=tulip+calvinismo+pdf PDF link annotation
    • https://cdn.sqhk.co/bovokolel/ghjckid/boromusasaginoz.pdfIn PDF document text
    • https://cdn.sqhk.co/rufebumu/bHieHhb/27872413300.pdfIn PDF document text
    • https://cdn.sqhk.co/xokebuzizo/jfsdjbe/john_gba_lite_emulator_pokemon_fire_red_cheats.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/tapelu/betternet_without_app_store.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3c56b83-f6c6-4aca-8f1c-0ea1a053a7d1/dell_optiplex_gx620_sound_drivers_for_windows_xp.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/fegizivawije.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/adding_filter_in_excel_sheet.pdfIn PDF document text
    • https://973697ad-ffa4-4f9d-85cd-0c9d1ea039ee.filesusr.com/ugd/5f5755_d2d8743d918b4a4a9d48146c807eea7a.pdf?index=trueIn PDF document text
    • https://ba789de2-c385-43ee-b32d-a34c698d1993.filesusr.com/ugd/b7082a_28812d6f06f04c918d07bbf88cab311b.pdf?index=trueIn PDF document text
    • http://tuzipani.rf.gd/bmtc_online_application_form_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c9d54d0-b6ec-4efc-92aa-e868b8a3aed1/11521698486.pdfIn PDF document text
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_b04c2e9e2e6e49ddb194af424ea03663.pdf?index=trueIn PDF document text
    • http://sejozewixexoba.rf.gd/cbs_sports_app.pdfIn PDF document text
    • http://najudugofuk.rf.gd/pamirujufudisimon.pdfIn PDF document text
    • https://s3.amazonaws.com/kosamupim/attendance_management_system_using_face_recognition_report.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezux/15199563766.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55a822a2-50af-49ca-9914-b45929ce15a3/mercury_110_9.8_fuel_pump_kit.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/98838463690.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa84e276-9fcc-40a9-9bfc-c76d9dd96194/factoring_polynomials_by_grouping_notes.pdfIn PDF document text
    • https://cbb9655c-b60d-4095-8c1c-bb5f9a2903c5.filesusr.com/ugd/4dd980_2c7149f2b9594e9282822caca7a68bfb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/90420688239.pdfIn PDF document text
    • https://8dac4d01-2cd1-45d2-8b5f-6005f802adc9.filesusr.com/ugd/1f96ce_d6b4b4f4f717467bb6926514aa9f2ab3.pdf?index=trueIn PDF document text
    • http://zudosikewemer.epizy.com/string_format_javascript_0.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_off00011c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3E 5212 bytes
SHA-256: dc5fd9b59633fc162663a8cf309cff157e98a869d89b2d1e2079d4ef21feb676
font_01_sfnt_off00012df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF2 11012 bytes
SHA-256: 61a37e7b591d684e9cfb98a654b688e5df2284e6af8f402e78b97e7ecc56a94d

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