Malicious PDF — malware analysis report

Static analysis result for SHA-256 3efc452d37f7cafc…

MALICIOUS

PDF

84.4 KB Created: 2021-03-20 16:25:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 01038b0f0a4fc4f4142fccae8123f381 SHA-1: c2b44fa59f775b82ade8a94ac63eb7d1c6160f80 SHA-256: 3efc452d37f7cafc5130a5e6049c948a73fddcf47b0046433d9bddbc960a634b
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The embedded URLs, such as 'https://zajinet.ru/wix?keyword=complete+manual+of+suicide+english+translation', are likely used to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://zajinet.ru/wix?keyword=complete+manual+of+suicide+english+translation PDF link annotation
    • http://gloslides.com/what_questions_to_ask_in_a_secretary_interviewgng0g.pdfIn PDF document text
    • http://marketes.pro/estudio_del_trabajo_i_temariot186u.pdfIn PDF document text
    • http://natikolom.site/jotul_602_n_review2xyfl.pdfIn PDF document text
    • http://beririka.scienceontheweb.net/614538328.pdfIn PDF document text
    • http://verifybadgehelp.com/sales_promotion_project_reportpvpny.pdfIn PDF document text
    • http://helplnstagramcontact6088758.com/worubalvzno0.pdfIn PDF document text
    • http://hdvideo.design/how_much_does_it_cost_to_install_a_hot_water_heater_expansion_tankdqokn.pdfIn PDF document text
    • http://reduslim-ufficiale.website/counterfeit_gods_tim_keller_free1ccsa.pdfIn PDF document text
    • http://raisinsapp.club/ribarogavewonopajusukotef3ya2a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e45098a8-a1ff-4008-b5a8-f14af747b855/how_does_the_tasmanian_tiger_protect_itself.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87d34eff-23ad-44f3-a7a0-542cfeb36644/12th_ethics_book_winmeen.pdfIn PDF document text
    • https://8323fb4f-9f65-46af-983a-6aec5a87103e.filesusr.com/ugd/84a5c6_c793a8e5cb074a65932f38b2f2a84055.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7f4a0c3-025b-4ba1-887d-4621b6333b7c/average_salary_for_business_analyst_in_california.pdfIn PDF document text
    • https://cd9ed9ec-87d1-42be-9198-0b2de6c1db4d.filesusr.com/ugd/158fb9_69704643c5744824a21554a155defef6.pdf?index=trueIn PDF document text
    • https://0e9c393c-9feb-4465-ae9d-4486bea7a644.filesusr.com/ugd/4b68be_555f7b597ba44ff786eaeabf48cd68a2.pdf?index=trueIn PDF document text
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_14aa673ed24641978be7e916fcaf3d98.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a75ebf44-f318-4f50-a296-6a2cbb81a695/lifetime_fitness_la_cantera.pdfIn PDF document text
    • http://birukuf.onlinewebshop.net/after_all_this_time_book.pdfIn PDF document text
    • https://d64d5b41-a66a-4b78-b87f-0feaf8e9cf76.filesusr.com/ugd/cf1aed_f7087d471cab4079898c58a8d75d2a7a.pdf?index=trueIn PDF document text
    • http://rosajeku.myartsonline.com/numpy_random_multivariate_normal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bf743bd-ec9a-457f-a192-5d8f0076b733/northouse_leadership_8th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b7b1118-1124-4120-a07c-70a7aefd9d09/how_to_descale_a_nespresso_vertuoline_machine.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB10 5476 bytes
SHA-256: 6e207f6ffc2e062e55ae93719bcda11416123f978c70b64b62844808955386e7
font_01_sfnt_off00010d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7C 12576 bytes
SHA-256: 238b728b2000fa78b4bc12e8c645e49e2e64d7826785c29dfe7126a5cbda1526
font_02_sfnt_off0001364a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1364A 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361