Malicious PDF — malware analysis report

Static analysis result for SHA-256 8936836be621be00…

MALICIOUS

PDF

92.6 KB Created: 2021-03-30 01:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 58c75389e8155653f0715af50d004d15 SHA-1: ff6d775312470e636c29418f18967cd853dba41e SHA-256: 8936836be621be00aa2dc0b8e9c03e55880acbc71e3a90b2d698954024e94afe
126 Risk Score

Malware Insights

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

The PDF contains an external URI pointing to a URL that is likely part of a phishing campaign, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings. The document body is heavily obfuscated, but the presence of embedded URLs suggests an attempt to redirect the user to malicious content. The primary attack vector appears to be spearphishing, with the PDF serving as an attachment to lure victims to a compromised website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/award?keyword=cave+art+history.+pdf PDF link annotation
    • http://energytik.net/pretty_little_liars_book_set_1-16qcaga.pdfIn PDF document text
    • http://pexarinolal.mypressonline.com/sosadesudejabiw.pdfIn PDF document text
    • http://ruvogodozipabiv.scienceontheweb.net/9290992362.pdfIn PDF document text
    • http://logoped-samara.ru/psychological_trauma_assessment6vrbn.pdfIn PDF document text
    • http://groshyk.site/distributed_hash_table_in_pythonoopn8.pdfIn PDF document text
    • http://kataeta.club/32189716651p81qw.pdfIn PDF document text
    • http://xulazawelinuze.scienceontheweb.net/breaking_into_wall_street_real_estate_modeling.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://mon-cmbretagne.best/xitenifutaxevivataiku6x.pdfIn PDF document text
    • http://uk-delfin.ru/67449200296umr7w.pdfIn PDF document text
    • http://fashion-deals.xyz/xolepabevanotebosunoxavowxb1.pdfIn PDF document text
    • http://fawikenaxalu.scienceontheweb.net/how_do_you_reset_a_keurig_after_descaling.pdfIn PDF document text
    • http://interbank.link/fabula_de_esopoi9014.pdfIn PDF document text
    • http://bio-ita.fun/wotamutazimovejupiwilan51f07.pdfIn PDF document text
    • http://myfavoritesun.xyz/44714117141t2bfl.pdfIn PDF document text
    • http://libertinemodels.com/17447287078k7dmd.pdfIn PDF document text
    • http://luchdobro.site/12162204431h8692.pdfIn PDF document text
    • http://forisawidokomor.sportsontheweb.net/assessment_for_learning_b._ed_notes_in_english.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d7301f0f-9730-4f6e-9d95-601e203cb770.filesusr.com/ugd/253413_8e0e084859514d768bc7687cef966776.pdf?index=trueIn PDF document text
    • https://fea67d75-dd3b-4bdd-af05-748e92ec8a52.filesusr.com/ugd/05900a_3c470ac38d544b57aae852772ddbce11.pdf?index=trueIn PDF document text
    • https://6d251753-49d0-4f5b-a278-10ed1cacc9d0.filesusr.com/ugd/5c139a_a34031639c4140a0940faee4b0811a21.pdf?index=trueIn PDF document text
    • http://liluratomakawu.rf.gd/amityville_haunting_movie.pdfIn PDF document text
    • https://2a403a33-5f6e-4534-96f9-742aa7325afc.filesusr.com/ugd/d2da83_aa001f4d1e844042b9c33e9301da675e.pdf?index=trueIn PDF document text
    • https://814bd5e1-0b6f-40f8-b2e9-6ab0015c5eef.filesusr.com/ugd/cc77ff_cd941bf57ca9412f9c477b0c10adf5a3.pdf?index=trueIn PDF document text
    • http://posufimiru.rf.gd/crystal_reports_editor_for_visual_studio_2017.pdfIn PDF document text
    • http://tipujujidudig.rf.gd/icse_class_5_maths_practice_worksheets.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_off00012f9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9C 5196 bytes
SHA-256: 87f4c81eb549f41a23b5969f5b36d3865132136d594f129cbcab714b116305f4
font_01_sfnt_off00014154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14154 10472 bytes
SHA-256: 1604d2f9c52d454ef7c50923a0a918daf0edee530857a6a8defe2a63be986d2d

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