Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a825be878383d6…

MALICIOUS

PDF

76.3 KB Created: 2021-03-24 15:40:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 353932f0eafe72a607196a32ffa5c7f8 SHA-1: 180b728c699b8946d3f670e415efcf4ad7c44287 SHA-256: 23a825be878383d6dbd9d228c23134053e13fca901de80e43e89354898dcc17a
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains, suggesting a phishing or malware distribution campaign. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document is part of a link farm designed to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jumiwimov.ru/award?keyword=short+notes+accounting+and+finance+for+bankers.+pdf
    • https://cdn.sqhk.co/fazovivum/Ijaao9L/homemade_chocolate_oreo_cake_recipe.pdf
    • http://bodaweziwov.mypressonline.com/list_of_irregular_nouns_in_english.pdf
    • http://dupuladusudired.mypressonline.com/25985311631.pdf
    • http://midarujiwuvi.mygamesonline.org/does_adhd_affect_behavior.pdf
    • http://itdiscounts.info/el_hobbit_parte_2_pelicula_completa_en_espaol_latinofbc6s.pdf
    • http://pedaxofanor.mywebcommunity.org/dekuwawomit.pdf
    • http://juwaniwabi.medianewsonline.com/alberto_caeiro.pdf
    • http://ganitigusawev.mygamesonline.org/53332162438.pdf
    • http://senteber.site/par_quoi_peut_on_remplacer_le_beurre_dans_des_biscuits1cvlt.pdf
    • http://boothattendant.com/solid_state_electronic_devices_streetman_7th_edition_pptk03zf.pdf
    • http://ses-sanobrabotka.ru/wunder_von_bern_torschtzen2bhiy.pdf
    • https://cdn.sqhk.co/napumefu/uhjVBys/word_search_puzzle_creator.pdf
    • http://naturaleone.space/49547674978obu76.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://71347f20-8353-4153-bebc-dd2a28b3a5cf.filesusr.com/ugd/a382ee_b3af81c70ad94557b4a072d7ae018ae2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/50b60bea-f520-4251-9a1c-0a945adef3db/best_soccer_drills_for_8_year_olds.pdf
    • https://uploads.strikinglycdn.com/files/a5689058-125e-4f28-9946-9d419aae391c/32286782756.pdf
    • http://gegurobaz.myartsonline.com/zivakewefidomadopemino.pdf
    • https://uploads.strikinglycdn.com/files/7ae08cf0-d832-408e-85c9-ebe39f37c851/moroxivobubizolurobojeme.pdf
    • https://f1e11ea9-a931-46ad-af30-391325c877dd.filesusr.com/ugd/423518_73efa93979964d1b9432cb21aa453207.pdf?index=true
    • https://73af689e-4c80-4f62-99d3-7a886641ad81.filesusr.com/ugd/3b5dd9_c46075632a4f42439ead21a935964565.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7e9.bin
ea940600bcdbcb8f36209dae6cc32117ab1bbab5abb757a699518f8690ddda27		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E9 5724 bytes
font_01_sfnt_off0000eb60.bin
5f3557ba76ec0934b7b8cd00b42853b4ea198588ae5c88f157df2ebf7b42f6e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB60 10552 bytes
font_02_sfnt_off00010f51.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F51 16204 bytes

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