Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8a2127944f85e72…

MALICIOUS

PDF

77.6 KB Created: 2021-02-18 08:43:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9dd44914a90965245936a0394f99f120 SHA-1: 4111a4ff205de5daebdbf57e5d34e9ce2cb02270 SHA-256: f8a2127944f85e72d09c2030ccd282c47afbb60ccbfddc95d48a86d0302bd354
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to suspicious domains, identified as a link farm and a redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to known malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

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://crophysi.ru/wix?keyword=free+kr+krunker+generator In PDF document text
    • http://sarkife.site/wujajolufotiwaf971k7.pdfIn PDF document text
    • http://efarbok.xyz/update_gradle_android_studio_ubuntu8b51b.pdfIn PDF document text
    • https://cdn.sqhk.co/dutedape/jbhdvhh/petsmart_word_unscramble_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/jivazufevi/iijdffK/grand_hotel_sunderland_free_phone_number.pdfIn PDF document text
    • https://cdn.sqhk.co/betewulo/64Oe6jp/halal_food_guy_restaurant.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479460/normal_6009034d60498.pdfIn PDF document text
    • http://regsen.website/easy_knight_helmet_templatecpu6q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405644/normal_60274b0b99165.pdfIn PDF document text
    • http://creamwalls.online/decimals_in_words_worksheet_grade_4156g1.pdfIn PDF document text
    • http://fasad-dom.site/nelogovebanuniximnytlo.pdfIn PDF document text
    • https://cdn.sqhk.co/xewafazuk/or0gcP1/sulerafefu.pdfIn PDF document text
    • https://cdn.sqhk.co/mixubiki/jhjjyhc/deroroweradizanoxiwesu.pdfIn PDF document text
    • https://cdn.sqhk.co/bitizulokiva/hdgcIdc/xekudameduxerakibeg.pdfIn PDF document text
    • https://cdn.sqhk.co/wibafozadil/ajjgCZJ/wobuwabezutixizewitit.pdfIn PDF document text
    • http://topcreditcheck.info/912211665874xq0u.pdfIn PDF document text
    • http://workmonster.net/help_informatica_numero_de_telefoneqjm9v.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59F 4664 bytes
SHA-256: 4fcebfb6281dd4a819e84a92f881e1690c04055be300724f7dadd109abf271bc
font_01_sfnt_off00010592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10592 10428 bytes
SHA-256: 2d601615e78164a540a41b3cd1a7a256d6da17cdf96dfda55f18a22db3732c34

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