Malicious PDF — malware analysis report

Static analysis result for SHA-256 d64ff65a3dc2e3a2…

MALICIOUS

PDF

76.6 KB Created: 2021-02-25 19:13:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b89f4f0d6488bf4a8af716fa5ff54a37 SHA-1: d1e0b487e1518314e8c74af4c032fe90e2e318cb SHA-256: d64ff65a3dc2e3a240d0e091886875873850758a6d932288bb2472853c576d2f
126 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or redirection mechanism. The presence of 'wkhtmltopdf' in the metadata and the nature of the URLs indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jacksth.ru/strik?utm_term=what%2527s+included+in+wendy%2527s+4+for+4 PDF link annotation
    • http://hurricane1.space/ap_environmental_science_biogeochemical_cycles_worksheet_answerssoubh.pdfIn PDF document text
    • https://cdn.sqhk.co/xaranoraf/gTSiihd/black_clover_phantom_knights_guide_fr.pdfIn PDF document text
    • https://cdn.sqhk.co/fugovigul/eJifhcn/kodiak_weather_underground.pdfIn PDF document text
    • https://roxupabepali.weebly.com/uploads/1/3/4/6/134611875/3562486.pdfIn PDF document text
    • https://febodume.weebly.com/uploads/1/3/2/8/132815732/2402455.pdfIn PDF document text
    • http://abistrans.ru/fopapuwen4zgcl.pdfIn PDF document text
    • http://homebig.space/wexafalobs86gr.pdfIn PDF document text
    • https://waniritapi.weebly.com/uploads/1/3/0/7/130739375/4404806.pdfIn PDF document text
    • https://vobakedipevurot.weebly.com/uploads/1/3/4/6/134661611/bodupanivoser.pdfIn PDF document text
    • https://cdn.sqhk.co/besogevipadi/iZwsggN/background_video_recorder_for_windows_7.pdfIn PDF document text
    • http://sis-paypal.com/allu_arjun_picture4tco4.pdfIn PDF document text
    • https://cdn.sqhk.co/peluxisomex/Ahcjegi/a_killer_game_of_hide_and_seek_movie.pdfIn PDF document text
    • http://trastqort.online/ethiopian_grade_5_english_textbookmlbfw.pdfIn PDF document text
    • http://yblda.fun/adobe_acrobat_pro_apk_for_androidku2rk.pdfIn PDF document text
    • http://summ-green.fun/iebc_job_application_form_for_temporary_employmentcfbwg.pdfIn PDF document text
    • http://trelon.fun/tumble_tree_timbers_instructionsiofhw.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/tutapaxi/42405851244.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/2004_honda_odyssey_tire_size.pdfIn PDF document text
    • http://zagebixomibolo.rf.gd/bloons_td_battles_game_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/bajegawulewevifitatek.pdfIn PDF document text
    • http://muvaxuzuf.rf.gd/jediguj.pdfIn PDF document text
    • http://rogasubuli.rf.gd/77405646957.pdfIn PDF document text
    • http://bubokamuwejutul.rf.gd/canon_pixma_mg3500_printer_troubleshooting.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/bali_guided_shopping_tours.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_off0000e952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE952 5440 bytes
SHA-256: 33683064222717d1986a3c5af7a64ca7d2b4cd7fac956f924af9709ccf734c43
font_01_sfnt_off0000fbf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF4 12036 bytes
SHA-256: 33675739b36c4031f8a3018fadd52be675115e249941cb906cfb2075fef3d544

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