Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c8d327d40da37b2…

MALICIOUS

PDF

74.1 KB Created: 2021-03-25 04:31:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 81179121b5273160411d132496210ad0 SHA-1: 1f505a81dbb1cfac9e5a39903e5595dc29b32000 SHA-256: 3c8d327d40da37b2d210e37091b18166efc363ff7d80c8aa7cadb49270f735c5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/wix?keyword=mario+flash+3.0+papa+jogos PDF link annotation
    • http://dostafood.xyz/57754204025qkb0t.pdfIn PDF document text
    • http://fefikaniki.22web.org/94467163253.pdfIn PDF document text
    • http://rewita.fun/caesar_3_game_free1hofp.pdfIn PDF document text
    • http://getfreecreditreport.info/liftmaster_csl24vdc_manualjl376.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/bible_atlas_free_download.pdfIn PDF document text
    • http://edaeda.moscow/long_way_down_lyrics_tom_odellfwvvi.pdfIn PDF document text
    • https://cdn.sqhk.co/mivadunoxo/iSmsa0z/guess_the_song_free_music_quiz_download.pdfIn PDF document text
    • http://foxiduwanati.mygamesonline.org/keurig_mini_plus_black_friday_2019.pdfIn PDF document text
    • http://gomigapujasep.sportsontheweb.net/muruzer.pdfIn PDF document text
    • http://nolaxevoxuvelij.iblogger.org/how_to_calculate_molecular_mass_of_a_gas.pdfIn PDF document text
    • http://phillipen.online/bapaketadira68yy0.pdfIn PDF document text
    • http://idealicaufficiale.website/van_de_graaffs_photographic_atlas_for_the_biology_laboratory_9th_editionpzf4s.pdfIn PDF document text
    • http://gefivinolegaz.22web.org/begona.pdfIn PDF document text
    • http://bigpleasure.ru/windows_10_pro_iso_freecwx58.pdfIn PDF document text
    • https://cdn.sqhk.co/figegixo/hhgjhjy/how_long_is_the_othello_tunnels.pdfIn PDF document text
    • http://gowanenutik.mypressonline.com/stand-up_comedian_meaning_in_english.pdfIn PDF document text
    • http://noverst.xyz/zugubasusufuruwifelisupork8xz4.pdfIn PDF document text
    • https://cdn.sqhk.co/rufosopufu/bUAX92o/fifa_indoor_soccer_field_dimensions.pdfIn PDF document text
    • http://nakodinita.scienceontheweb.net/tutuxitodutab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EE 5584 bytes
SHA-256: ffebc9e482d874ad7a0050c74a6b58b5ccec26385d0cecdc91a4c7ebaf085dac
font_01_sfnt_off0000f5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F7 11680 bytes
SHA-256: e640ef0ac818dfe4b7310973a0f7c94d26619d1e4d41cab7cb9f602b89e3b6b3

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