Malicious PDF — malware analysis report

Static analysis result for SHA-256 5498de169d2f70d2…

MALICIOUS

PDF

99.8 KB Created: 2021-02-24 01:03:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2d07135b3eb9576da8d8ff8f02da5576 SHA-1: 91e0bae8d33601a531255cde5af060bd96fc74b3 SHA-256: 5498de169d2f70d2d2e1906af68d72bd7f3491293d2abfa7670c0e3dfc16aa5d
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links that redirect to external websites, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or deliver further malware. No scripts were extracted, but the presence of numerous links suggests an attempt to direct the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=amps+for+black+and+decker+iron+reviews In PDF document text
    • https://cdn-cms.f-static.net/uploads/4416802/normal_600d57184d654.pdfIn PDF document text
    • http://optalpha.com/sojikoloxd0viq.pdfIn PDF document text
    • http://fezanabuxa.22web.org/65358077113.pdfIn PDF document text
    • http://anbieterbewertung-autoscoutch.com/countable_and_uncountable_nouns_worksheet_for_grade_2xxonc.pdfIn PDF document text
    • http://help-igcopyright.xyz/vilupachzas.pdfIn PDF document text
    • http://serodot.iblogger.org/ddp_yoga_workout.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381082/normal_5fc7a8bc65c06.pdfIn PDF document text
    • http://docita.fun/jozakunexiw2cuna.pdfIn PDF document text
    • http://community-day.ru/classic_shell_scripting_arnold_robbinsy2ef4.pdfIn PDF document text
    • http://vijasoga.22web.org/15367716080.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://zazupixuwup.rf.gd/pojedupajalowojego.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/bppv_exercises_spanish.pdfIn PDF document text
    • http://welididoseburiv.epizy.com/human_relations_theory_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/gate_2018_instrumentation_books_free.pdfIn PDF document text
    • http://levewome.epizy.com/3643747467.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/us_passport_renewal_form_in_person.pdfIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/chennai_express_full_movie_mp4_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C49 5356 bytes
SHA-256: 18c46215e7e935f34e9fa95e8bc202d1cc73bb9ed582ee3d76194b32c900ce52
font_01_sfnt_off00014e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E61 10872 bytes
SHA-256: 6c326115328351a15a02aed1a96dc83f2bdb6e6a456c2acedbd044a323cee7e6
font_02_sfnt_off0001738b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1738B 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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