Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5c50b37e870b4fa…

MALICIOUS

PDF

76.2 KB Created: 2021-02-26 14:09:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: dabda464eb001fa274182dcbbfd1eea1 SHA-1: 4ac4443cce1f41063b76eba07f510ea01da41cda SHA-256: e5c50b37e870b4fa5fc2b0eea58bd02a4def1bb87e197e3ed0bc338ee3844cb0
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to link farms hosted on disposable domains, masquerading as free downloads for popular content. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this is a link farm designed to distribute further malicious content. No scripts were extracted, but the overall pattern indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/wix?keyword=that+time+i+got+reincarnated+as+a+slime+light+novel+pdf+free+download PDF link annotation
    • http://xumupizaxuto.scienceontheweb.net/dell_optiplex_9010_aio_power_supply_replacement.pdfIn PDF document text
    • http://coolstudent.space/approaches_and_methods89zvv.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/cub_scouts_bear_handbook.pdfIn PDF document text
    • http://smeshnoykir.space/vegetable_calorie_chartkijt3.pdfIn PDF document text
    • http://luminar3-download.xyz/read_sports_illustrated_magazine_onlinex095t.pdfIn PDF document text
    • http://xejopegig.mypressonline.com/rekomor.pdfIn PDF document text
    • http://24goodstore.site/kinsey_report_2019u57qr.pdfIn PDF document text
    • http://watogoda.mypressonline.com/91370372098.pdfIn PDF document text
    • http://gekodejevotug.medianewsonline.com/rarebixovinuraba.pdfIn PDF document text
    • http://m-laskin.ru/hunger_games_mockingjay_part_1_full_movie_online_freefj35j.pdfIn PDF document text
    • http://kamikofonem.mygamesonline.org/how_to_install_adobe_flash_player_in_chrome_android.pdfIn PDF document text
    • http://jiwapadenejeza.getenjoyment.net/how_to_play_a_life_cleric_5e.pdfIn PDF document text
    • http://xuzerujagojagip.scienceontheweb.net/how_do_i_cancel_my_enercare_water_heater.pdfIn PDF document text
    • http://thelait.pro/steelseries_arctis_3_work_on_xbox_onexzwbi.pdfIn PDF document text
    • http://kufafukedexepix.mygamesonline.org/dazajekipoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rukosivujuxu.atwebpages.com/free_bible_commentary_download_for_android_mobile.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_off0000e26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26D 2940 bytes
SHA-256: b255dc2f10caa7cf961bab1172e8a2d2e5e83e097d684c71f73ac3a8f13737b6
font_01_sfnt_off0000eceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEB 5668 bytes
SHA-256: 31714f93c8f2f09e6216c1508710be23e2e7a8af7b0f4441b5cb722ec1a6f7ec
font_02_sfnt_off00010021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10021 10016 bytes
SHA-256: 7f12657c28fccd7c3a5f41d2217864c7a59749d8bd31d3b83171bde90cb1f23d