Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0a1a13f6ec87c6c…

MALICIOUS

PDF

75.5 KB Created: 2021-03-15 15:51:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4d146d65bd21660b32e407a1d2a277f9 SHA-1: 2fc7a93b5dc6557f0d0d43e3898dad1b5de1da32 SHA-256: d0a1a13f6ec87c6ce8d8c74bdd52717221918f12c6cfd19c359232c92ee3be6c
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier strongly flagged this PDF as malicious. The presence of external URIs and the link farm heuristic suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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/123?utm_term=elementary+statistics+worksheets+pdf PDF link annotation
    • https://cdn.sqhk.co/sepovili/oijZdFJ/mujalines.pdfIn PDF document text
    • http://xenobezunareso.22web.org/diwitagiwadafinejarugu.pdfIn PDF document text
    • http://vijofudevadotar.mywebcommunity.org/the_beloved_charioteer_summary.pdfIn PDF document text
    • https://cdn.sqhk.co/dexasubu/jiifjjW/download_stickman_meme_battle_simulator_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/pejinijew/fjjgdyx/buwumofepesase.pdfIn PDF document text
    • https://cdn.sqhk.co/kerodamajop/haFhejd/ximatezepisivejagogal.pdfIn PDF document text
    • http://vijevejumozugim.sportsontheweb.net/38432934468.pdfIn PDF document text
    • https://cdn.sqhk.co/gorisaburo/eeDgfjb/idle_arrows_apk.pdfIn PDF document text
    • http://lowabunuzoxa.getenjoyment.net/yasin_tahlil_dan_doa_ziarah_kubur.pdfIn PDF document text
    • http://zijafanovidiz.sportsontheweb.net/26697628218.pdfIn PDF document text
    • http://jepewadagamer.scienceontheweb.net/98988368287.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zogutofarori.epizy.com/pdf_to_word_converter_app_for_windows_7.pdfIn PDF document text
    • http://xinovedef.rf.gd/33805108115.pdfIn PDF document text
    • http://boberuxu.rf.gd/jurnal_tumbuhan_angiospermae.pdfIn PDF document text
    • http://gigavebeno.rf.gd/99265333193.pdfIn PDF document text
    • https://s3.amazonaws.com/fasudikek/half_blood_prince_chapter_28.pdfIn PDF document text
    • http://jegowijuvu.epizy.com/fegov.pdfIn PDF document text
    • http://fetopenatafef.rf.gd/the_last_lecture_chapter_6_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/kenmore_ultra_wash_quiet_guard_deluxe_model_number.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/inmate_booking_report_dona_ana_county.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/8940487685.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/annamalai_tamil_movie_audio_songs_free.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_off0000e947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE947 5608 bytes
SHA-256: ed71d03c97503b89fcf25934a738032975598c2c4deefa6a0a6f5d0b4ae4f63f
font_01_sfnt_off0000fc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4D 10772 bytes
SHA-256: 28e393a35f00d3b3c64e18489ae9278ba9adf50b0fde3d11fef51b239512a76e

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