Malicious PDF — malware analysis report

Static analysis result for SHA-256 86bcecffc3db201a…

MALICIOUS

PDF

81.4 KB Created: 2021-05-13 05:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c4185388d99a90c50200e832b1a705b4 SHA-1: 687f730a0b418b0396fa33722a0bf6e18a82ea82 SHA-256: 86bcecffc3db201a0e87a74559fffabc738eac500ce9a880fe74afa87fc1a96a
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to link farms and disposable hosting, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains a reference to 'How to connect jbl flip 5 speakers together', which is likely a lure to direct users to the malicious URLs.

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://bologen.ru/strik?utm_term=how+to+connect+jbl+flip+5+speakers+together PDF link annotation
    • https://cdn.sqhk.co/vujaderaz/dIwic7n/fedemobuz.pdfIn PDF document text
    • https://cdn.sqhk.co/zebenane/jfmi8gg/crazy_taxi_city_rush_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/pozigafo/jgje2Up/32335811079.pdfIn PDF document text
    • https://cdn.sqhk.co/kerutadit/EjaiaTU/text_twist_free_online_gamehouse.pdfIn PDF document text
    • http://itfamily.pro/how_much_does_it_cost_to_open_up_a_pawn_shop9lawc.pdfIn PDF document text
    • https://cdn.sqhk.co/favejofu/jiWZBhb/gelakesevabibu.pdfIn PDF document text
    • http://nudistoff.club/consolation_of_philosophy_sparknotes_book_1lq1zu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c4a5d104-04f9-44e6-b03f-1f5edac3680f.filesusr.com/ugd/f23921_39e0ac39be5d4a08834de936ab2d4158.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/794b13f6-0fd7-408a-9a13-947723290fec/tikozemuketopeduz.pdfIn PDF document text
    • https://37bcb4aa-7747-4ff6-a352-0e22bf983c21.filesusr.com/ugd/4393d3_431fd6c0bb9045b5ba5011fa48a2838a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/76660505427.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/hidden_object_i_spy_printables_for_adults.pdfIn PDF document text
    • https://30d6ba4c-d201-4e26-8f31-a0e059b28788.filesusr.com/ugd/f9b8bb_3daf328c07aa4c5f81475aa1207b438d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/25246329058.pdfIn PDF document text
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_5eb4e25f42dd498aaf5a99a696ca0ada.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/faxaxos/special_incident_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39cfaae7-17a7-4cb5-b231-310bd949c5c5/46630925279.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e733ea35-3362-4088-87ae-c4c307869f84/cunto_tengo_que_ganar_para_recibir_estampillas_de_comida.pdfIn PDF document text
    • https://cd753cf5-d90a-4073-9c55-931a76e81761.filesusr.com/ugd/8826df_8722f8d20f2f4aaa9e01a389abebbce2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/74c39bac-5c85-4ccc-9319-d7353cde5e9a/81940418570.pdfIn PDF document text
    • https://68e1e3d4-268d-49bc-a8aa-b119cb10fea7.filesusr.com/ugd/3ceeb9_9d46b2be569341fd9d462426991b0674.pdf?index=trueIn 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_off0000fa6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6D 5736 bytes
SHA-256: ae9a524b0ae5634a71f58645b10ffb8e61af01f2ad5f6960116f60e84090d1ae
font_01_sfnt_off00010e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E08 12400 bytes
SHA-256: fe0f18e0aa1c6fcdb50ff7a71a4b22a19cab2f8b91e5bded62ce2ddc95269cd6

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