Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f027a7459acc687…

MALICIOUS

PDF

80.0 KB Created: 2021-04-14 08:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 1827457a9c1d789b45b20e60b7ed118a SHA-1: 20eb5e958a70afa715f0a699733df62ebeb3b08a SHA-256: 9f027a7459acc6873be20218efc5bef114f6bdf83bd361252700d28d12fe74de
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The document body text, though garbled, includes a phrase that appears in one of the malicious URLs, suggesting a lure to a phishing or scam site. No scripts were extracted, but the PDF structure itself facilitates redirection to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/strik?utm_term=always+be+the+smartest+guy+in+the+room PDF link annotation
    • http://vosajizegek.mypressonline.com/what_determines_standard_enthalpy_change_of_formation.pdfIn PDF document text
    • https://zevakevo.weebly.com/uploads/1/3/5/4/135400716/4b78e.pdfIn PDF document text
    • https://vexuzunudupugez.weebly.com/uploads/1/3/0/7/130740013/8764031.pdfIn PDF document text
    • http://umniashka.ru/ap_literary_terms_practice_testubuqa.pdfIn PDF document text
    • http://pixell.store/bio_time_clocking_systemsekyxc.pdfIn PDF document text
    • https://zuvumurujibuza.weebly.com/uploads/1/3/0/7/130739557/sipenotab-guredavogowu.pdfIn PDF document text
    • http://paxabak.mypressonline.com/coding_challenges_for_python.pdfIn PDF document text
    • http://alternativeinfluencenetwork.net/what_is_the_ip_protocol_number_for_ospf_packetsqbbkf.pdfIn PDF document text
    • https://kuribigewisowe.weebly.com/uploads/1/3/4/6/134688213/2630705.pdfIn PDF document text
    • http://hisgohar.site/2532955924448va2.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://xiwesesakuvel.medianewsonline.com/principles_of_geotechnical_engineering_7th_edition_solution_manual_free_download.pdfIn PDF document text
    • https://bovusobovazova.weebly.com/uploads/1/3/4/5/134596491/687252.pdfIn PDF document text
    • http://moxawunanenubop.sportsontheweb.net/weber_grill_charcoal_holder.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xiwevitox/fapifovofem.pdfIn PDF document text
    • http://kadizilurojiniz.onlinewebshop.net/free_printable_january_2020_calendar.pdfIn PDF document text
    • http://lugivodunoxasi.atwebpages.com/haryana_current_affairs_2020_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/the_face_on_the_milk_carton_summary_chapter_14.pdfIn PDF document text
    • http://nakixaxev.myartsonline.com/python_chatbot_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/27255033794.pdfIn PDF document text
    • http://gubadif.myartsonline.com/myers_briggs_test_infj.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_off0000fa41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA41 5424 bytes
SHA-256: 9585710ed4b2f468431d138cf680fdf260288eddc37b0c0178fda0ffb8af8f80
font_01_sfnt_off00010c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9E 10684 bytes
SHA-256: 281229e6131a79a15deca3c93b5914c43e53645bae42d57102ab772a6ec57f54

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