Malicious PDF — malware analysis report

Static analysis result for SHA-256 038ef26a9709cb4d…

MALICIOUS

PDF

95.6 KB Created: 2021-04-07 03:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2e6914fbf7aca05f78805ea57eabeae9 SHA-1: 76c9cbb3853e406ebb54abc227186c01d90073ab SHA-256: 038ef26a9709cb4d826a5a283048c8268130af614388f2cbbf436c10e91598a7
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution, by presenting deceptive download links. No scripts were extracted, but the PDF structure itself is designed to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9898

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=swami+kadambari+pdf+download PDF link annotation
    • http://golesaluwo.66ghz.com/11589484401.pdfIn PDF document text
    • http://sukifomona.iblogger.org/hinario_5_ccb_orgao.pdfIn PDF document text
    • http://sofebitaxed.iblogger.org/business_process_reengineering_definition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469836/normal_60684e98bb2b8.pdfIn PDF document text
    • http://tufinanegonaj.medianewsonline.com/interview_questions_on_java_programming_with_answers.pdfIn PDF document text
    • http://lorezagosuvese.scienceontheweb.net/gamegijimaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450632/normal_605c2b6827ce4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379601/normal_60506d014663c.pdfIn PDF document text
    • http://vegavos.22web.org/woberejedetekaxorufek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452861/normal_5ff59dd54e778.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464541/normal_605479e4acdca.pdfIn PDF document text
    • http://robugipunebib.mygamesonline.org/xobebebisej.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
    • http://fedorahosted.org/lohitIn PDF document text
    • http://nifusotajezunur.atwebpages.com/cetosis_en_vacas_lecheras.pdfIn PDF document text
    • https://fc9a8e44-b853-4378-b933-957c6fa9ceda.filesusr.com/ugd/1da781_749224ad6f9d4186a4e993f309c3df5d.pdf?index=trueIn PDF document text
    • https://2e03c77f-99cc-4591-9807-54d8d49c9ce6.filesusr.com/ugd/759733_6f02ce98e22345a3a26ffd173b3ed14d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8f73142-5d05-4cda-9c7b-ca0446ce4eed/what_is_the_difference_between_lc9_and_lc9s.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/cetonas_exogenas.pdfIn PDF document text
    • http://jitimixilu.epizy.com/bajarangi_kannada_film.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/muwunuxowig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7e4c8e8-fb51-48ac-af5a-eb414f105549/brown_bird_with_orange_beak_and_feet.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/10487463879.pdfIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_01646205627344e5b36e139803b39724.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wixanarer/bleacher_report_epl_player_rankings.pdfIn PDF document text
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_97607da2660c42f3b8766cc21495f1a1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/deed52a5-1e5f-4522-9d82-da3d3b5f392f/89189280845.pdfIn PDF document text
    • https://5d3a357a-25b2-4459-9cd8-210b235f7b36.filesusr.com/ugd/45e30f_a6d51c7cf9514f639f376b956eb74c65.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rufonali/43987216161.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3184b846-da33-4672-9fbe-b78a1fd69370/human_computer_interaction_job_prospects.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5494b103-261e-4776-964a-51c82eaccf32/lafin.pdfIn PDF document text
    • http://tosurok.myartsonline.com/red_lobster_nutrition_facts_2021.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A5 5000 bytes
SHA-256: cf136812061590d9d002047be488156099315a97551d23bea6ad11de2afe88f8
font_01_sfnt_off00010a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A80 10820 bytes
SHA-256: 2c7baffa16a8a23daebeae1f469d6a6b742e81eaa46637fd6ee55754c651b7a6
font_02_sfnt_off00012fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA2 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
font_03_sfnt_off00013da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA3 16840 bytes
SHA-256: 64f0d4aa7dfa5721d03efe7a8add8f847690111b9c1158465143d31d98e5d385