Malicious PDF — malware analysis report

Static analysis result for SHA-256 f966ca2ef5c211ee…

MALICIOUS

PDF

71.2 KB Created: 2021-03-19 12:24:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e4271d020e0b4ec04fadd706287942a7 SHA-1: de7288144999b8157f9b67698dac0333e7a8fced SHA-256: f966ca2ef5c211ee751892584be1e3a0bf7a3fb61774c379a67104b9fe184b33
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured to appear as download links, aligning with a phishing or social engineering attack pattern. The heuristic 'SE_DOWNLOAD_BUTTON' further suggests a lure to trick the user into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/award?keyword=applied+mathematics+3+kumbhojkar+pdf+download PDF link annotation
    • http://fortuneo-enligne.com/18850525499efbkl.pdfIn PDF document text
    • http://venira.su/2127349444m0tj.pdfIn PDF document text
    • http://autoupgrade.website/mac_os_latest_version6i93f.pdfIn PDF document text
    • http://dlkmvkoenv.info/xegogudibau8cgy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448110/normal_5fe7c190446cc.pdfIn PDF document text
    • http://siteznakomstv69.space/thrust_bearing_chartu4qd0.pdfIn PDF document text
    • https://jeximikukadolo.weebly.com/uploads/1/3/1/6/131636734/zagafuvowod_jalokud_palemomu_siwumudo.pdfIn PDF document text
    • http://fc-aromat.ru/lean_manufacturing_course_australiatbeh1.pdfIn PDF document text
    • https://polabobaxadujo.weebly.com/uploads/1/3/4/7/134775235/xapikori_pukumubamapobe_fagiv.pdfIn PDF document text
    • http://com-servers.online/magazine_article_interview_formatf6we7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421468/normal_6035df888ecb2.pdfIn PDF document text
    • https://filekudop.weebly.com/uploads/1/3/4/0/134017403/dulibujirupufom-walala.pdfIn PDF document text
    • http://flymoney.net/country_2_step_rap_songjhv89.pdfIn PDF document text
    • http://tosety.xyz/waresewedizokenomozalurufldemm.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/83fa2b8a-1cd0-4d81-8b7e-9ecb29c5400e/laregiro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c69a8b5f-986c-4097-b9a8-8bcd9e7302c5/45795848868.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d1dd3d6-c5c6-4274-bb25-b778806a7967/what_is_tribal_leadership.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f0b842d-db64-4b8f-80ba-f9b6c20f2444/dichotomous_key_worksheet_aliens_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d1a6374-c4c5-4e62-bca5-26a389e04b6c/para_que_sirve_la_vitamina_d3_50_mcg_2000_iu.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_off0000d61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61F 5920 bytes
SHA-256: 01f3c4a00fc732f5334f29169c21f76c4a2ecb56eff30dd1c69a2a3d0ff1fa92
font_01_sfnt_off0000ea28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA28 11064 bytes
SHA-256: 3a8f9855a19cc59af5594638c22d299e1faf1a568b0f56ce2acdfb133904d770

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