Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c8a5a90ff3a2af4…

MALICIOUS

PDF

79.1 KB Created: 2021-03-06 23:51:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 054f337b65398de236322b748b5a3e9f SHA-1: f67ad0be36b74cf34c568d0636001d979c494dcc SHA-256: 2c8a5a90ff3a2af4f571ca87238ed3fcdae02dd94305a40231cf768c5f4fade2
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous embedded URLs, with one specifically appearing as a search result lure for 'how to use black and decker hole saw'. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is part of a link farm designed to distribute malicious content. While no scripts were explicitly extracted, the nature of the heuristics and the embedded URLs strongly suggest the document is intended to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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://xajibur.ru/wb?keyword=how%20to%20use%20black%20and%20decker%20hole%20saw PDF link annotation
    • http://kanaxade.mygamesonline.org/65239417402.pdfIn PDF document text
    • http://olipaka.xyz/11988121336grr7n.pdfIn PDF document text
    • http://goproits.com/java_for_32_bit_windows_xphunrv.pdfIn PDF document text
    • http://giwosoto.sportsontheweb.net/how_to_test_a_fan_limit_switch.pdfIn PDF document text
    • http://sibatike.getenjoyment.net/56981242207.pdfIn PDF document text
    • http://garant-ritual.online/radiantly_alive_scheduleg2hbs.pdfIn PDF document text
    • http://nepoxiduvilej.scienceontheweb.net/pinufivujizizu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405638/normal_602bf83dc213a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420248/normal_5fd932ee7c072.pdfIn PDF document text
    • http://piruzinomezobif.22web.org/descriptive_writing_worksheets_grade_2.pdfIn PDF document text
    • http://mobeditobaxul.scienceontheweb.net/stihl_ms310_years_made.pdfIn PDF document text
    • http://lenugaguv.medianewsonline.com/74389574761.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/32e1d693-dada-4652-910a-1ef411ca82f9/15050812709.pdfIn PDF document text
    • http://mugazukadum.onlinewebshop.net/game_of_thrones_episode_5_recap_season_1.pdfIn PDF document text
    • http://malukofe.rf.gd/how_to_reset_arris_surfboard_router.pdfIn PDF document text
    • http://vekejuf.atwebpages.com/factory_reset_compaq_presario_cq57_notebook_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f32cd629-1ca2-4c2b-9aa1-c04bf79616ff/90820452438.pdfIn PDF document text
    • http://rigidafavubo.myartsonline.com/describe_the_rainy_weather.pdfIn PDF document text
    • http://niforubuduxema.epizy.com/androids_dbz_legends.pdfIn PDF document text
    • http://tumitodutib.rf.gd/how_to_sterilize_spectra_pump.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c74f9332-bf42-4c2c-b463-180b47fe4d11/53967391103.pdfIn PDF document text
    • http://xofunuxemijowex.rf.gd/adobe_illustrator_software_free_softonic.pdfIn PDF document text
    • http://gakajitaju.atwebpages.com/student_application_information_sheet_lehman_college.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_off0000f973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF973 5284 bytes
SHA-256: c721d8118fcdf11fddfc81b9da4127cb19f168719c5d74d257e2bbab55b115ef
font_01_sfnt_off00010b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6D 10376 bytes
SHA-256: b9a66164c386f9e8769c01efad56c550f50e0a3df16f4787be5b8bdc1a0594ec

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