Malicious PDF — malware analysis report

Static analysis result for SHA-256 33cd8a47816e3f45…

MALICIOUS

PDF

76.0 KB Created: 2021-04-06 08:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 73c3d7d3121450077ba5721773440451 SHA-1: cf78b0b1cd11a0b4d79c2b8d8f616ec5aae97eb7 SHA-256: 33cd8a47816e3f45b0adae8dda9415e56dad5e62d76edbf1ecd339c4c845254f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain associated with phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jottigo.ru/strik?utm_term=introductory+biomechanics+from+cells+to+organisms+solutions PDF link annotation
    • http://waystep.site/zavejinebiatog4.pdfIn PDF document text
    • http://ca-management.website/36563842606vmbma.pdfIn PDF document text
    • http://pewekelexu.mygamesonline.org/sevilla_isaac_albeniz_guitar.pdfIn PDF document text
    • https://cdn.sqhk.co/foseziwate/cjQgg3j/highway_bike_racing_games_online.pdfIn PDF document text
    • http://xuvaxujogilo.mygamesonline.org/drawing_faces__features_learn_to_draw_step_by_step.pdfIn PDF document text
    • https://cdn.sqhk.co/pelopuxi/ihLkgiy/nitamasiruvada.pdfIn PDF document text
    • http://hellochildren.online/lxx_interlinear_greek-englishn9l1g.pdfIn PDF document text
    • https://cdn.sqhk.co/sorubajuzoxe/DhiSUgh/download_shared_video_from_microsoft_stream.pdfIn PDF document text
    • https://cdn.sqhk.co/kevovevude/2gexlNX/mekozomukujun.pdfIn PDF document text
    • http://pemufosapakem.mypressonline.com/journal_el_watan_du_jour.pdfIn PDF document text
    • http://gagitevanonuti.mywebcommunity.org/cirque_du_freak_full_movie_free.pdfIn PDF document text
    • https://cdn.sqhk.co/mewuwemiromi/d9ynRid/zoregofaji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://siparedobapu.rf.gd/byram_healthcare_supply_order_form.pdfIn PDF document text
    • https://3794eb9c-cc8b-492c-aecc-44533f76aaa6.filesusr.com/ugd/1ee69b_5102f574683d4a0ab92c8578f6a8f9c0.pdf?index=trueIn PDF document text
    • https://6cdb29d4-22ce-4aaf-9e51-562b59d50851.filesusr.com/ugd/1b20fb_e59e6d25dcca4e29b203cc676455edb8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mukutud/falciform_ligament_ligamentum_venosum.pdfIn PDF document text
    • http://suwimifu.rf.gd/rekebirogukenoja.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/toro_weed_wacker_accessories.pdfIn PDF document text
    • http://situfixumuvefom.rf.gd/was_germany_powerful_before_ww1.pdfIn PDF document text
    • https://f8206d31-21c4-4aef-9da9-e4259ded718a.filesusr.com/ugd/c2bdac_6c8e2612ec3b442685453e440801d8a8.pdf?index=trueIn PDF document text
    • https://2559d30b-64cd-4b4d-aaad-e76a675dde99.filesusr.com/ugd/f5a024_34b98ec46c0747138fe40836870073e8.pdf?index=trueIn PDF document text
    • https://4a31e3f8-49e3-4331-b1a9-c0bb7a6b9dbc.filesusr.com/ugd/599f1c_a39ec331da2041c2afcdf61bee69c366.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD536 5616 bytes
SHA-256: 35ef6e4e6faf618651b3596b7064b42cc2d105abfa975c3bf73385923eafc903
font_01_sfnt_off0000e82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82C 10580 bytes
SHA-256: 2dd266f6fd3fb4de31db38e55ecb44ec31023e0650a6907d8870639d05dca8fc
font_02_sfnt_off00010c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C80 16084 bytes
SHA-256: 7bb111f4ce79ba48502a837b83d40e55cd246b86015b702aadb01736ca16f5d3