Malicious PDF — malware analysis report

Static analysis result for SHA-256 99dd382dbbd07ecd…

MALICIOUS

PDF

80.9 KB Created: 2021-03-30 04:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c81903c978408d6b0472a747bc799f0f SHA-1: 56844928a92907258ea796e17f8d99334b0cd861 SHA-256: 99dd382dbbd07ecdb0a1aaa9d3131adc57c147b30afee1508555e6347aa5122a
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and it contains numerous embedded URLs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/award?keyword=conjuntivitis+bacteriana+en+ni%25C3%25B1os+tratamiento+pdf PDF link annotation
    • https://cdn.sqhk.co/jibezilesu/c1hhge6/space_racer_3d.pdfIn PDF document text
    • https://cdn.sqhk.co/nurafurofopu/AigdfRK/vexed.pdfIn PDF document text
    • https://cdn.sqhk.co/winogolelog/AJdgfid/mibubagixalevurok.pdfIn PDF document text
    • http://fibisazorowax.mypressonline.com/au_bonheur_de_ces_dames_ekladata.pdfIn PDF document text
    • https://cdn.sqhk.co/moxoxitij/eicmAjg/rebalenu.pdfIn PDF document text
    • http://gonurivufufebi.iblogger.org/kewupigolesezekifudixuvik.pdfIn PDF document text
    • http://premiumpornclips.com/video_instagram_app_ios3j0w1.pdfIn PDF document text
    • http://lujadexezusunam.22web.org/sap_crystal_reports_runtime.pdfIn PDF document text
    • http://faxixovojaja.sportsontheweb.net/how_to_connect_universal_remote_to_sharp_roku_tv.pdfIn PDF document text
    • http://vixinusagodax.scienceontheweb.net/adobe_reader_10_free_download_for_windows_xp.pdfIn PDF document text
    • https://cdn.sqhk.co/gedugari/V62IBjg/mibabaxalefokebunofuruku.pdfIn PDF document text
    • https://cdn.sqhk.co/mixaluwekitu/hehghfb/vopemeduvupogewumupusus.pdfIn PDF document text
    • http://prodson.space/what_does_the_word_chalk_it_up_meantqh59.pdfIn PDF document text
    • https://cdn.sqhk.co/begokaxawip/GyHVico/sky_q_on_apple_tv_uk.pdfIn PDF document text
    • http://fosireditoj.mygamesonline.org/challenger_annuity_rates.pdfIn PDF document text
    • http://gesaribenufemi.iblogger.org/27611656947.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://satanomoxa.rf.gd/minecraft_1._8_free_pc_windows_7.pdfIn PDF document text
    • http://bopulamumu.rf.gd/82686132402.pdfIn PDF document text
    • http://zumaruzafomadik.rf.gd/dokusufitidigekuzimusetez.pdfIn PDF document text
    • http://mokosikok.rf.gd/6994033272.pdfIn PDF document text
    • http://wamulax.epizy.com/aruba_iap_315_installation_guide.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_off0000fc02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC02 5660 bytes
SHA-256: f02bcd69bc0a7197755d744ccfe9f756adc02731d5d13274a45ff2cf62007cfc
font_01_sfnt_off00010eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEC 11352 bytes
SHA-256: 649b742da0eacd57d96f9445db99beb083647863191b81474f2b4b33ed64237d

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