Malicious PDF — malware analysis report

Static analysis result for SHA-256 3439edb18f94283b…

MALICIOUS

PDF

150.4 KB Created: 2021-04-04 18:34:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d9ec8dbeb7a70e48ee2592bc1c3c31e3 SHA-1: 7d3579fffdd658db161e6463e6e14aaf40399a8d SHA-256: 3439edb18f94283bb4c359842c43f5a0465e8f13489c15df7647bf4af31c6812
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, appears to be a lure for downloading PDF files, likely containing malware. The presence of external URIs and the link farm heuristic suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/award?keyword=panchatantra+stories+english+pdf+download PDF link annotation
    • http://beritox.medianewsonline.com/curso_de_numerologia_tantrica.pdfIn PDF document text
    • http://br1.red/blender_video_editing_manualoarll.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446374/normal_605f9f9334b90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369664/normal_6023888391b2c.pdfIn PDF document text
    • http://miribut.mywebcommunity.org/9743870217.pdfIn PDF document text
    • http://vbnmcxz.xyz/girivefesuzabosi102oc.pdfIn PDF document text
    • http://polikarmonolit.ru/inorganic_chemistry_best_book_for_mscl9gxm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382639/normal_5ff716c64fd6b.pdfIn PDF document text
    • http://upsbox.ru/gudupusaztoq2t.pdfIn PDF document text
    • http://jezojarugeboz.22web.org/wewiseluvokapewapiv.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/gjRij7j/69697636384.pdfIn PDF document text
    • https://cdn.sqhk.co/fivodewile/igdJkPz/time_traveler_s_wife_quotes_movie.pdfIn PDF document text
    • http://blog-millionaire.buzz/does_osha_require_employers_to_pay_for_hard_hatsq6wxm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://vekamodadon.onlinewebshop.net/mito_definicion_y_caracteristicas_para_nios.pdfIn PDF document text
    • http://xunixamobogu.epizy.com/telugu_movies_2019_hd_3gp.pdfIn PDF document text
    • http://disigulopenanij.rf.gd/halloween_worksheets_for_fun.pdfIn PDF document text
    • http://sasebuza.epizy.com/el_viaje_definitivo_poesia.pdfIn PDF document text
    • http://woxanegerofokox.rf.gd/bootstrap_app_landing_page_template.pdfIn PDF document text
    • http://baxewape.myartsonline.com/42127561000.pdfIn PDF document text
    • http://nozosikela.rf.gd/87573288602.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E6A9 5508 bytes
SHA-256: f6a9718c1bf8989d358f8d3cd0e3aebf16810c4e88862b4c76473e9e9fe68ac0
font_01_sfnt_off0001f975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F975 16400 bytes
SHA-256: d28a8f30c1d11123ae39474693b3e517ab3f349315801347104379790d5d9b87
font_02_sfnt_off00022852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22852 16756 bytes
SHA-256: 725429d7bf7128ca67abfa80f740803e0a6d8f464a2408d8fc9e4215a72a8ba6
font_03_sfnt_off00024018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24018 2828 bytes
SHA-256: 8b7f17878021cceaffde6eadfac61f96db816862ca42c9886b3bcc0cef409a26

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