Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd46fa1b8882e7b6…

MALICIOUS

PDF

77.1 KB Created: 2021-03-29 23:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c4cd1115278e231790d0915a04814b8b SHA-1: a11773936ecdb1f3a1e5d376f5f788025a1ce5c9 SHA-256: bd46fa1b8882e7b6efd38c67444211720514cd8df29635bc98ee42fa2f1835ba
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/award?keyword=bulking+training+program+pdf PDF link annotation
    • http://zapitexidij.mypressonline.com/du_b._ed_entrance_exam_syllabus_2020.pdfIn PDF document text
    • http://nakidki-alkantara.xyz/15918116973s6xmq.pdfIn PDF document text
    • http://timinome.getenjoyment.net/4888629405.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416494/normal_5fe2640d71afa.pdfIn PDF document text
    • http://bcpzonasegurape2-viabcp.com/42042638761tntem.pdfIn PDF document text
    • http://polystate.ru/xumezezogifagawuwetijidakrsq13.pdfIn PDF document text
    • http://itsamorem.com/serezugeqwpj.pdfIn PDF document text
    • http://lisifakus.66ghz.com/empire_building_games_offline_for_android.pdfIn PDF document text
    • http://mamontov-net.cc/punnett_square_practice_middle_schoolxaqpi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366339/normal_6044cf1036595.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/1d556f3a-320e-40a6-a607-6ec34ecfd41f/how_to_use_gimp_2.10_on_mac.pdfIn PDF document text
    • http://xolavozezimodan.onlinewebshop.net/libros_de_louisa_may_alcott_en_espaol.pdfIn PDF document text
    • http://roripufunubome.rf.gd/how_to_return_mail_to_sender_australia.pdfIn PDF document text
    • http://tirujukixiw.epizy.com/silaferuxipikuvupagaxixi.pdfIn PDF document text
    • http://mowelafawugek.epizy.com/61123857649.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/bozafefakevufukalid.pdfIn PDF document text
    • http://gevutolexufa.epizy.com/possessivpronomen_bungen_a1.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/wolfram_mathematica_for_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8909927-3a09-4b87-8460-7606553299ab/pogamuvogepanox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f112b1de-7db3-49a8-8bd8-a8afecc38174/dupud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8f7b931-1631-45e7-80e0-acb50000dbc1/59520168909.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_off0000f163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF163 5296 bytes
SHA-256: 845acbcf1efdc608e7cf6e261370ef247fba88b7f779063f3ea0b0ca5b7bc731
font_01_sfnt_off00010356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10356 10416 bytes
SHA-256: fbedbf39289a092fbe72b8e6dfef4f84449e7cddc832c1b2fe31a376b49311a9

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