Malicious PDF — malware analysis report

Static analysis result for SHA-256 30b28f45b5c3725c…

MALICIOUS

PDF

73.3 KB Created: 2021-03-02 10:32:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 434e41b94a203a99cb3489d981990352 SHA-1: 4c55584c5f544464a7971ae3204c0761f765a784 SHA-256: 30b28f45b5c3725cc259b40cf7043e9a921876e19443dc90c88de182dc2f5b83
134 Risk Score

Malware Insights

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

The PDF contains multiple external URIs and is flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The presence of a 'download button' heuristic further supports the lure-based attack pattern. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest it is designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leonvi.ru/wix?keyword=nintendo+ds+emulator+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4478968/normal_603af4ee39d95.pdfIn PDF document text
    • https://zisefedid.weebly.com/uploads/1/3/4/7/134767142/robakine.pdfIn PDF document text
    • https://cdn.sqhk.co/sesijisova/gdghigh/2_player_one_pc_games_offline.pdfIn PDF document text
    • http://gopururin.iblogger.org/compare_and_contrast_essay_sample.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418558/normal_5fe4fc65edc42.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450417/normal_5ff623223da66.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://punegejofuj.epizy.com/office_inventory_list_excel_template.pdfIn PDF document text
    • http://zowiseli.epizy.com/badalitorutofofibivud.pdfIn PDF document text
    • http://bikutuvuxaxixo.epizy.com/facebook_app_free_latest_version.pdfIn PDF document text
    • https://s3.amazonaws.com/tugafebip/29739906062.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/chocolate_film_video_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/fintie_folio_case_for_kindle_fire_hd_7_2013_old_model.pdfIn PDF document text
    • http://devuzobek.rf.gd/example_of_paragraph_with_topic_sentence_and_supporting_details_and_concluding_sentence.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_off0000e394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE394 5140 bytes
SHA-256: 0c15c092c25f6cc95948a229a20177b08d92db2e03d4f3c5f36a5aad68860d9d
font_01_sfnt_off0000f4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F4 10380 bytes
SHA-256: 5e0e16f6b5f08365a724d57e28df8fe23e1f0030d508bc05585dd26f915f4c66

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