Malicious PDF — malware analysis report

Static analysis result for SHA-256 c90b363299bcb720…

MALICIOUS

PDF

124.2 KB Created: 2021-03-30 16:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 5d0e9b5822e9eb16c0b80fb890732ccb SHA-1: 09148af04f077d1cb9eaa015f9cc3108f528dd27 SHA-256: c90b363299bcb72095b7e66843be87955e646fc987c968852c4756d1946dba79
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a potential phishing lure related to 'notes on digestive system'. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The presence of external URIs and a link farm heuristic further supports the attack pattern of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/award?keyword=notes+on+digestive+system+of+human+body+pdf PDF link annotation
    • http://metarapuw.mypressonline.com/meeting_agenda_form.pdfIn PDF document text
    • http://xexapitanegis.getenjoyment.net/fundamentals_of_astrodynamics_and_applications_vallado.pdfIn PDF document text
    • http://gulibej.22web.org/types_of_articles_in_english_grammar.pdfIn PDF document text
    • http://linavaluviriv.getenjoyment.net/60576725187.pdfIn PDF document text
    • http://all-system7.xyz/desierto_drive_mexican_dreamgo1v1.pdfIn PDF document text
    • http://workbykoder.xyz/can_you_wear_a_long_dress_to_a_cocktail_weddingi3kaq.pdfIn PDF document text
    • http://farunoraxukiz.getenjoyment.net/3400147872.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://fufirewavit.getenjoyment.net/60670045832.pdfIn PDF document text
    • http://fonevanezonufo.iblogger.org/conditional_and_biconditional_statements_worksheet.pdfIn PDF document text
    • http://wssummer.space/73838828843hc7l0.pdfIn PDF document text
    • http://runolive.com/24562344632jhzxg.pdfIn PDF document text
    • http://xitnet.fun/list_of_mathematical_constantspdpzs.pdfIn PDF document text
    • http://prizinsta365.online/the_fall_guy_streaminghfcow.pdfIn PDF document text
    • http://daravto18.ru/faregakimizudn5jbe.pdfIn PDF document text
    • http://foripekomufotir.mypressonline.com/soligusikirodeg.pdfIn PDF document text
    • http://useplafond.xyz/business_math_printable_worksheets_4th_gradex7yuo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xusapibu.onlinewebshop.net/69170199958.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/neel_akash_bagania_song.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/barapovuno.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/exponential_growth_and_decay_worksheet_answer.pdfIn PDF document text
    • http://jefedajuwefafi.rf.gd/actividades_que_realiza_un_mecanico_industrial.pdfIn PDF document text
    • http://rolubumemetujin.atwebpages.com/feed_conversion_ratio_formula_poultry.pdfIn PDF document text
    • http://ririgigiwabub.epizy.com/bokupajedixoruruxe.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/android_room_delete_query_return.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_off0001abe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABE2 5596 bytes
SHA-256: 8d01dbc316c9b4a916bed8f45d6d46ba5e9558367fc3833bd21a126d6f1d8f47
font_01_sfnt_off0001bed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BED9 10996 bytes
SHA-256: b2aa4df41e501fa4e755fa1f3e5e2a9fae549630c07555cb09c225c0ebf5ef28

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