Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b86dc9f2463c2e…

MALICIOUS

PDF

64.5 KB Created: 2021-02-07 11:08:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a7897bc9fcb104a354491c708728828a SHA-1: 7738f37eb5ce30c709c4ba5928f91d912b939afe SHA-256: b9b86dc9f2463c2e583bdfa78c846d322b1458abc16b828e2f00881cadf1ce59
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jacksth.ru/wb?keyword=cells%20membrane%20cell%20transport%20notes%20guide PDF link annotation
    • http://saratov.ooo/xps_to_converter_apkvvefi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413563/normal_5ff617b3f04b2.pdfIn PDF document text
    • http://hookup153.site/kavufukevogatimalumagra4of.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496148/normal_5fe628f19983a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375700/normal_5ff079e064782.pdfIn PDF document text
    • http://helps-lnstagramcopyrights-about.com/650744353394ic29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420432/normal_600b51f84c9fa.pdfIn PDF document text
    • http://youralteragoods.com/sony_nsg_mr1_manualzhwa3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428083/normal_5ff1162df194f.pdfIn PDF document text
    • http://derewopenila.22web.org/dbms_query_interview_questions_and_answers.pdfIn PDF document text
    • http://livecopyrightverification.com/54128760313jvl9d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424040/normal_5fffcdb0b1b3f.pdfIn PDF document text
    • http://retys.fun/megadimension_neptunia_vii_walkthroughy53ie.pdfIn PDF document text
    • http://timecodes.net/badger_meter_pc100_manualrennj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387054/normal_60033603829b9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://witibepav.rf.gd/chandu_telugu_movie_video_songs.pdfIn PDF document text
    • http://jefebewo.epizy.com/avengers_tamil_dubbed_movie_collection.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxirefare/arrow_symbol_vector_free.pdfIn PDF document text
    • http://tuwafexom.epizy.com/rifalolidojixarelo.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/fufavenalakilub.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/89544706782.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/fesexubiredakolit.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/bastar_university_supply_exam_form_2019.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_off0000c0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E9 5436 bytes
SHA-256: 93428026e1d50dbca9a2dca4fbb87a2e928365ff9f2445615cb93021fda94da3
font_01_sfnt_off0000d339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD339 9636 bytes
SHA-256: 1e70fc53703a7f5288de99e92c9275f3a44d5c251746c04274a20159b27e2f82

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