Malicious PDF — malware analysis report

Static analysis result for SHA-256 f665e225d77fa688…

MALICIOUS

PDF

97.7 KB Created: 2021-05-13 04:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4dee63d6c83fa1ce55314628bd536b5c SHA-1: 273a39f8b1bd1177d39bfb3a61ae0e3e5fa93f9f SHA-256: f665e225d77fa688f14f96bca4c719ceac094b68305d23c64725d53d1fabea3a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant portion pointing to disposable hosting and employing UTM parameters, indicative of a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://seumenha.ru/strik?utm_term=what+is+another+word+for+instructions PDF link annotation
    • http://xuribof.medianewsonline.com/125181883.pdfIn PDF document text
    • http://zavudonalu.66ghz.com/74015286157.pdfIn PDF document text
    • http://lulopoboxefon.scienceontheweb.net/37483084958.pdfIn PDF document text
    • http://lukiduxipapep.mywebcommunity.org/what_is_dynamic_workout_galaxy_watch.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://s3.amazonaws.com/gulapore/what_are_the_methods_of_active_listening.pdfIn PDF document text
    • https://2e5cbe44-7de3-4e3f-b94c-8a8567814465.filesusr.com/ugd/f96b02_cf258cc4fc104ff4b79815a5e01fc672.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0eb25292-3ce6-4f82-92cf-24f8d74a1565/23436343088.pdfIn PDF document text
    • https://95043331-d9de-4498-ad98-35b8ac3ee23f.filesusr.com/ugd/5740b2_3959132d150341d7bb154e316efedf30.pdf?index=trueIn PDF document text
    • http://maledikenuxod.rf.gd/avital_remote_start_4105l_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/the_good_war_studs_terkel_sparknotes.pdfIn PDF document text
    • https://db7841a4-af10-4990-a2be-f084cd4acbf6.filesusr.com/ugd/e3c460_91bc237ccd2a4afcb515accffdff5417.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4eff334f-4e5d-4e71-bbb4-ab428898477f/lord_of_the_flies_chapter_7_study_guide_quizlet.pdfIn PDF document text
    • http://kikebunubalexu.rf.gd/english_grammar_test_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/tibejilufawexorol.pdfIn PDF document text
    • http://mefufoseza.rf.gd/intercessory_prayer_requests_catholic.pdfIn PDF document text
    • https://8f20b4bd-83f7-4a55-8c6f-e9501e2e061c.filesusr.com/ugd/c1c462_d2af728dce4f41a8b1d0e226474abc8c.pdf?index=trueIn PDF document text
    • http://juvogexef.rf.gd/l_alchimiste_english.pdfIn PDF document text
    • http://xizokenimufewom.atwebpages.com/wacom_annotation_mac.pdfIn PDF document text
    • https://e1dd9d5d-2564-403b-b9eb-750b563e155e.filesusr.com/ugd/00b056_b82b1890ad764e5b82732e8a889ea2be.pdf?index=trueIn PDF document text
    • https://a72b158e-cead-41d6-a0b3-8518216316a4.filesusr.com/ugd/35c6e2_3c4cd50168b7435cbfcf4d97424a9462.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b7d1bda-07a9-42b1-9d6b-74254b93bba1/sibipavuzopasekuze.pdfIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/lapureluganigal.pdfIn PDF document text
    • http://nejarisiwudu.atwebpages.com/all_world_airport_codes.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C6 6416 bytes
SHA-256: 9e91590ae502ff902ba306624a00c8d44396a7ee9717b1bfa1717db63fe08483
font_01_sfnt_off0000f799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF799 5064 bytes
SHA-256: 6063861583e89e09bba7e23ffa81d0b80f77e9759f31dd5ab4e4138a36c123fb
font_02_sfnt_off000108cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CF 9360 bytes
SHA-256: 41be3306dc8a72ed47cf7efdcb0492975044c9ec7346821c3f23fc6918592a5d
font_03_sfnt_off000126cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CD 10492 bytes
SHA-256: c5f32316d61372c98cc8b06f796ed27efb2665a23bdcd4683861601f67bc7017
font_04_sfnt_off00014b00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B00 16256 bytes
SHA-256: 0c28d55d9957e5be45f9d3302843a1d8772fc4e8a9a81ea04eed1b5cc2016f23
font_05_sfnt_off0001606e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1606E 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
font_06_sfnt_off00016e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E21 1740 bytes
SHA-256: 0fa38b11e28a8990e1b947714e894fba9dc87d533679748745bc540cfc52814c

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