Malicious PDF — malware analysis report

Static analysis result for SHA-256 15335aaa75d98ca6…

MALICIOUS

PDF

85.2 KB Created: 2021-04-02 04:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6592420bb4a444359bec81ef5b846c6c SHA-1: a05fe51d47b4092eb025d2a71ef524d4cfd6dd4e SHA-256: 15335aaa75d98ca6b6563c040623ed4af01d76252e8a1f48c351fd73be9f821d
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, suggesting it functions as a link farm or phishing lure. The PDF structure and embedded URIs point towards an attempt to redirect users to potentially harmful content, aligning with spearphishing tactics.

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://bologen.ru/wix?keyword=biology+final+exam+review+answers+2019 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4497687/normal_603d012a3667f.pdfIn PDF document text
    • https://cdn.sqhk.co/jepinixawide/ogj19c4/android_adaptive_battery_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451950/normal_6054585f66bd4.pdfIn PDF document text
    • http://gavediteriremuv.medianewsonline.com/xiwimujawe.pdfIn PDF document text
    • https://cdn.sqhk.co/fedelubu/hicifaN/toluzonisezusojoguparime.pdfIn PDF document text
    • https://cdn.sqhk.co/fasotaluvose/3jjifge/mlb_playoffs_format_wiki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465000/normal_5fdab5d97cd5a.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/jiYg2ii/ultimate_dragon_simulator_free_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/leloxoreje/Tggj0jd/best_light_meter_app_for_iphone_5s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387420/normal_5fd340645bc0c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xiriwut.epizy.com/kandungan_buah_belimbing_wuluh.pdfIn PDF document text
    • http://tefetuzuzip.myartsonline.com/depulopuve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/716a78b1-5301-4d88-b17a-06da49cd10d3/3m-30_filtrete_thermostat_manual.pdfIn PDF document text
    • http://kifesafijupesob.onlinewebshop.net/reaes_dos_alcoois.pdfIn PDF document text
    • http://navibav.epizy.com/sisebitapokebekan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a9732f2-2e81-4c37-8eb5-013e597b9780/imagery_in_romeo_and_juliet_act_3_scene_1.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/datonufewezo.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/que_es_taller_de_lectura_escritura_y_oralidad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10ab7228-eaea-4667-a59f-b2225687f68d/bulova_precisionist_watch_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/mibubumidim.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_off00010a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6B 5940 bytes
SHA-256: 947b6073692122c4a12e075c18d03d1db5d9856c381a12860a1c0415dec6d517
font_01_sfnt_off00011eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB7 12176 bytes
SHA-256: e6742d609f5b637a8eb8dd4af65f331f24a4a9460192fa994066d092185b0719

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