Malicious PDF — malware analysis report

Static analysis result for SHA-256 c52547367d9ecf14…

MALICIOUS

PDF

70.8 KB Created: 2021-03-28 18:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 59bb2e200eb48e0ed517552b28f33080 SHA-1: a28771bd5e1a166c8e8bf7e989f0875c9458412c SHA-256: c52547367d9ecf141369a56634f28ce761b8251d501ea68d6700dcce4c1186bf
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The presence of external URIs and the overall structure suggest an attempt to trick users into visiting potentially harmful web pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jottigo.ru/award?keyword=inspirerend+coachen+jef+clement+pdf PDF link annotation
    • http://rexuwoxaga.sportsontheweb.net/spectrum_math_workbook_grade_6_answer_key.pdfIn PDF document text
    • http://pumorux.medianewsonline.com/baby_little_red_riding_hood_costume.pdfIn PDF document text
    • http://tricitysikhs.com/bandwidth_manager_windows_7_freefu94c.pdfIn PDF document text
    • http://1gusevshop.space/clicker_heroes_import_databbhkc.pdfIn PDF document text
    • http://bu-markett.com/xexalinekoreb0woa.pdfIn PDF document text
    • http://lnstagram-helps-contact.com/bokuketu0tre3.pdfIn PDF document text
    • http://familyit.info/percy_jackson_disney_plus_dreamcasts7opm.pdfIn PDF document text
    • http://idealica-uficialeitalia.website/jaisalmer_tour_guide1yvob.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://dusexixegiseves.iblogger.org/sweet_recipes_with_puff_pastry_sheets.pdfIn PDF document text
    • http://passive-income.ru/411977524121t3lo.pdfIn PDF document text
    • http://nigavereke.mygamesonline.org/adding_and_subtracting_fractions_with_like_and_unlike_denominators_worksheets.pdfIn PDF document text
    • http://teaitalis.space/97198069797xo9s.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lumixi/turning_process_using_cnc_lathe_machine.pdfIn PDF document text
    • http://vanomuwoz.epizy.com/88584955643.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/let_s_go_band_sheet_music_flute.pdfIn PDF document text
    • https://fb7bf4c5-056f-4058-a7d1-073478569b53.filesusr.com/ugd/d90490_4a4209df3a7043e79576d091dfb2fcd3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/free_sheet_music_for_say_something.pdfIn PDF document text
    • http://telaratar.epizy.com/69186526752.pdfIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_0e044506a657413a8a135782539df087.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/supogumadidabikat.pdfIn PDF document text
    • https://681956c7-2c57-495f-b996-d04b50c745b0.filesusr.com/ugd/907d98_de8765d0270247b983a6ccd7820aa9c3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gapivegek/womasetovenomowudakudagu.pdfIn PDF document text
    • http://kalilom.epizy.com/jelosujoso.pdfIn PDF document text
    • http://gukutimaguvuzum.onlinewebshop.net/cathode_ray_experiment.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_off0000d7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D2 5408 bytes
SHA-256: 72447531a58299d7e96ac304ca4f42405fd872b68baf407f1f73e30a03adc728
font_01_sfnt_off0000ea13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA13 10596 bytes
SHA-256: a9574319345d14ccdb37474402fcbb519a8c7cb3963e60b7ca1fd0daba04d49e

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