Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3dcc86219239e4d…

MALICIOUS

PDF

83.0 KB Created: 2021-02-25 10:27:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 504394778b7aa1e6c00199920cc30eca SHA-1: 470cb475ee24edfa1d670dafafa216d69b6fe412 SHA-256: d3dcc86219239e4de98521384e91d943893fc1166695e29b0dd8fe53380de04c
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The presence of a 'download button' lure and the ML classifier's high confidence score further support a malicious intent. The document likely serves as a phishing lure, attempting to trick users into downloading a payload or visiting a malicious site under the guise of a firmware upgrade.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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
  • 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://crophysi.ru/strik?utm_term=asus+ac1900+firmware+upgrade In PDF document text
    • https://static.s123-cdn-static.com/uploads/4422658/normal_60029cf717346.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475380/normal_6017acd7dbc46.pdfIn PDF document text
    • http://yarrebitteh.online/bukonusawizodajolovuremasglos.pdfIn PDF document text
    • http://urott-hu.com/what_forms_an_acidic_solution_in_watervidxs.pdfIn PDF document text
    • http://azules.ru/russian_cars_priorik_2eqriq.pdfIn PDF document text
    • http://dutakevekuw.iblogger.org/gospel_choreography_songs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415944/normal_603687500fe27.pdfIn PDF document text
    • https://cdn.sqhk.co/xekowodu/jTWiiib/football_heroes_pro_2017_coin_glitch.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416661/normal_5ff293dd73813.pdfIn PDF document text
    • http://crawlmqyu.space/why_is_my_dishwasher_leaking_at_bottom_of_doorjurez.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487935/normal_6003bdafb1dd1.pdfIn PDF document text
    • https://cdn.sqhk.co/lukedivibeb/qriegff/rotten_tomatoes_top_action_movies_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469617/normal_5fe864a8cf76e.pdfIn PDF document text
    • http://radanews.site/add_text_to_photo_free_apkistkz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391015/normal_601f3b401b806.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://muzeduv.rf.gd/whats_the_lug_pattern_on_a_ford_ranger.pdfIn PDF document text
    • http://rumajajoneder.rf.gd/icds_9_borrowing_cost.pdfIn PDF document text
    • http://zukizibukuxupir.epizy.com/zufeniwapirusigonafeva.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_off000103f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F6 5872 bytes
SHA-256: bb8dde0cfac4e5f7e91a733725817071a1999fb8711e7027602330acb93df217
font_01_sfnt_off000117f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F9 11532 bytes
SHA-256: 909b747a8725f6e651b1964a4293f0e8c7fa3ea30aa46a8a6768d9e27648039f

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