Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab8625340294532d…

MALICIOUS

PDF

86.9 KB Created: 2021-03-24 05:18:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 36eb018de5fef6e1a8dad678ef471c64 SHA-1: 61c500bea522ea62891c8ff44282f5c908abafa5 SHA-256: ab8625340294532dbe31d20b7385d17a6dcb6e87f67cee3d7533a88d5cf081d4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including a link farm on disposable hosting, suggests a phishing or credential harvesting attempt. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the lure mechanism, directing users to click a link that likely leads to a second-stage payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nipisod.ru/strik?utm_term=how+to+get+certified+in+a+nursing+specialty PDF link annotation
    • http://zuzatew.medianewsonline.com/ct_scan_brain_tumor.pdfIn PDF document text
    • http://nebo-baikala.ru/what_years_did_chevy_make_impala_ss4wmv4.pdfIn PDF document text
    • http://mifvideo.space/malayalam_bible_free6h9d5.pdfIn PDF document text
    • http://zevewidojodot.mywebcommunity.org/definition_of_education_by_different_philosophers.pdfIn PDF document text
    • http://fipoziwebetaz.22web.org/buwubagiditemun.pdfIn PDF document text
    • http://demuxum.getenjoyment.net/jk_master_slave_flip_flop_truth_table.pdfIn PDF document text
    • https://cdn.sqhk.co/visobipibe/ehbiiIM/50640756867.pdfIn PDF document text
    • http://bcpzonasegurape2-viabcp.com/924676042088bfu4.pdfIn PDF document text
    • http://jukojadijomefar.medianewsonline.com/agile_process_model.pdfIn PDF document text
    • https://cdn.sqhk.co/vefuwatak/ifjijdO/fox_sports_directv_schedule.pdfIn PDF document text
    • https://cdn.sqhk.co/rojopuvukit/jfVUtHn/police_officers_shot_in_compton_identified.pdfIn PDF document text
    • http://setokanekema.mygamesonline.org/94447767947.pdfIn PDF document text
    • http://gebameguw.iblogger.org/amana_portable_air_conditioner_14000_btu_review.pdfIn PDF document text
    • http://legegapepapo.medianewsonline.com/digaluka.pdfIn PDF document text
    • http://miwewumexurigan.sportsontheweb.net/72728579594.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ritikaju.epizy.com/nowirefe.pdfIn PDF document text
    • http://dipibezepipes.rf.gd/43056294686.pdfIn PDF document text
    • http://ledufowi.myartsonline.com/what_is_custom_number_format_in_excel.pdfIn PDF document text
    • http://pizuzol.onlinewebshop.net/space_4d_cards_download.pdfIn PDF document text
    • http://zejibanunepi.myartsonline.com/delavubuxujowumebem.pdfIn PDF document text
    • http://bexalawisilinot.epizy.com/instrumentation_engineering_notes.pdfIn PDF document text
    • http://fomonew.rf.gd/acls_manual_de_bolsillo_2020.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_off000115fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FC 5476 bytes
SHA-256: c5482f1c614ccc5776d73d601a7818ac78c85c556262240777b69068cfe79fc9
font_01_sfnt_off000128c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C9 10796 bytes
SHA-256: d81f4fc8098deaec3cbc2b492a4db7c98a4f690b019f3c0b04a11a72cf2d9b92

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