Malicious PDF — malware analysis report

Static analysis result for SHA-256 b70bf6e2fea4dc35…

MALICIOUS

PDF

83.7 KB Created: 2021-03-30 16:26:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b1845efe835dc7121029ee70e847201d SHA-1: 947585b2108415d295a8233562bab0348f3a3e3f SHA-256: b70bf6e2fea4dc35797ae01acedfb985d3b1621bacae37eb409af9cc51deb2aa
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it is likely a phishing trojan. It contains numerous embedded URLs, with a primary suspicious URL pointing to a domain associated with malware distribution. The document body, though heavily obfuscated, suggests a lure related to educational materials to mask its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://midufefew.ru/award?keyword=capitalization+worksheets+for+grade+2+pdf PDF link annotation
    • http://laitlabs.pro/which_atom_in_each_pair_has_the_larger_atomic_radius_circle_your_answer5vsrm.pdfIn PDF document text
    • http://kayikciakademi.com/34923689500i5nmf.pdfIn PDF document text
    • http://moitender.org/61469271887vu4c4.pdfIn PDF document text
    • https://kufojinelimipi.weebly.com/uploads/1/3/0/7/130776518/dukurorobixirav_ditelaved.pdfIn PDF document text
    • https://papukelub.weebly.com/uploads/1/3/4/6/134666119/5873279.pdfIn PDF document text
    • http://4escam-bot.online/282372874183940t.pdfIn PDF document text
    • https://nesefutuderixu.weebly.com/uploads/1/3/2/7/132740375/3842d7c5.pdfIn PDF document text
    • http://xejubevaj.22web.org/2706251677.pdfIn PDF document text
    • http://thepropheticapp.com/36062040152pzyuv.pdfIn PDF document text
    • http://kuxogajow.iblogger.org/magazine_graphic_design.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/04d86772-14ac-44c0-8a43-1e69a950ca6d/2005_nissan_pathfinder_car_seat_covers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1327dff3-6954-4eed-929f-362fba9dfbf2/resumen_del_libro_de_los_muertos_literatura_egipcia.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/1368982776.pdfIn PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/website_to_see_chegg_answers_free.pdfIn PDF document text
    • http://tudexobus.rf.gd/guxazazejekopuk.pdfIn PDF document text
    • https://s3.amazonaws.com/wowonesoribu/consul_template_environment_variables.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b35ba16e-91c8-432c-982c-3746a06a35dd/5th_grade_math_word_problems_worksheets.pdfIn PDF document text
    • http://gedemuzufo.epizy.com/biochemistry_ebook_download.pdfIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/synergy_editor_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a35e4d7-0e94-44cd-8a95-2867e48c3cd7/construct_2_full_version_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ac53905-9ef3-4f2a-87e7-45311e204f50/28473230072.pdfIn PDF document text
    • http://finubovuputok.epizy.com/10320782915.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/xedatam.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_off000106e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E7 5548 bytes
SHA-256: 4728225b939ba26a7d3ab63687be6765424870ae2148c8d66bf28e990a990049
font_01_sfnt_off000119d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D7 11588 bytes
SHA-256: a746dd9b6cc325127f522e60a0852790101845e9a5285658d8a6e9a13fc73b86

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