Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3f65fcc670e48ac…

MALICIOUS

PDF

77.8 KB Created: 2021-04-07 01:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 3313f0df8125bf7417811a878624a33a SHA-1: d52916f6214ad414d3bfaef968df60d2b8dc30c9 SHA-256: b3f65fcc670e48ac54b38a7e9f81ae50dd23571f75e8edb3a4553d6ea22b851e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs suggests an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/award?keyword=mister+sandman+chet+atkins+pdf PDF link annotation
    • http://xarapover.mygamesonline.org/64794423953.pdfIn PDF document text
    • http://yourcy.com/mens_mountain_bike_helmet_reviewsklbfc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375896/normal_60055e669451f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496225/normal_60144a6e8a293.pdfIn PDF document text
    • http://carishr.com/yard_king_snowblower_10_29_reviewj5aui.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://coloradocustomelectric.com/xavil3g4us.pdfIn PDF document text
    • http://rowexusaje.mypressonline.com/hp_pavilion_dv6_webcam_driver.pdfIn PDF document text
    • http://witaxolexigabi.mywebcommunity.org/56397137679.pdfIn PDF document text
    • http://suzamajotibe.mywebcommunity.org/polygons_worksheet_answers.pdfIn PDF document text
    • http://rawitotizoxuk.scienceontheweb.net/what_order_to_read_mortal_engines.pdfIn PDF document text
    • http://lnstagramverifiedbadgeservice.com/cat_jumping_off_car_memewse5j.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gubawakelu.onlinewebshop.net/64642638502.pdfIn PDF document text
    • http://gotewadale.epizy.com/simple_present_exercises_for_beginners_questions.pdfIn PDF document text
    • http://maretubozewugi.myartsonline.com/78629468375.pdfIn PDF document text
    • http://xibiwoziveva.epizy.com/zozubonaxirebuze.pdfIn PDF document text
    • http://wififeju.atwebpages.com/philips_led_lighting_price_list_2020_download.pdfIn PDF document text
    • http://sawopirorafo.rf.gd/17896769912.pdfIn PDF document text
    • http://rawuvotatu.rf.gd/european_guideline_variation.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C4 5108 bytes
SHA-256: 60baf9d4dc72c1e0c8abc6321d77677c24517a0f11d81f983d01161eeccf8c6a
font_01_sfnt_off0000f7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EE 10696 bytes
SHA-256: f08f55562f5f52fe2b2e3372e233daaf0fdab576b2d4488b1faba3e4e7060e12
font_02_sfnt_off00011c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2A 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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