Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbec3286a408621e…

MALICIOUS

PDF

73.1 KB Created: 2021-05-05 23:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: f999551e356afb47e5f63d3061f32ead SHA-1: 228761dc7c2377d798663d99015a45190c6ed98d SHA-256: fbec3286a408621e3a543647b03c2db535594fb0e1536d529fce21c5610fa64c
184 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs, many pointing to disposable hosting and redirector infrastructure, indicating a likely phishing or malware distribution scheme. The presence of a link to a known malicious redirector further supports this assessment.

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/strik?utm_term=teeter+hang+ups+nxt-s+inversion+table+assembly In PDF document text
    • https://cdn.sqhk.co/razonavari/dQifhje/arrowood_golf_course_membership.pdfIn PDF document text
    • http://toxipoxekej.medianewsonline.com/business_plan_for_online_shopping_website.pdfIn PDF document text
    • http://towufato.mywebcommunity.org/enfermedad_por_deficiencia_de_vitamina_k.pdfIn PDF document text
    • https://cdn.sqhk.co/tevosudav/cDKSsjb/fuzipen.pdfIn PDF document text
    • http://negifowutagur.mygamesonline.org/how_to_make_book_review.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389127/normal_6000d19a8fa8d.pdfIn PDF document text
    • http://ketoxitigojaluk.sportsontheweb.net/mavudonenabek.pdfIn PDF document text
    • http://tuzojexis.mypressonline.com/fascial_spaces_of_the_head_and_neck.pdfIn PDF document text
    • https://cdn.sqhk.co/nosimasiv/iDhxUXf/basketball_easy_free_throw-_choco-_to_throw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416506/normal_6018da9e6d1ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382194/normal_60514b7ef2c4c.pdfIn PDF document text
    • https://cdn.sqhk.co/libodinidep/MMjj3gc/city_racing_lite_mod_android_1.pdfIn PDF document text
    • https://cdn.sqhk.co/dutebevon/iiiFgf8/men_s_adidas_x_star_wars_ultraboost_19.pdfIn PDF document text
    • https://cdn.sqhk.co/koditisalupe/XjcjcrU/tibavepejodokosatibexa.pdfIn PDF document text
    • https://cdn.sqhk.co/zurefaxenov/hjheifu/13439776742.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368996/normal_5fe8d352277f8.pdfIn PDF document text
    • https://cdn.sqhk.co/vozofugova/GjbP2hb/close_air_support_soul_knight.pdfIn PDF document text
    • http://gomijexa.mywebcommunity.org/14794644482.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tudixuzaw.onlinewebshop.net/catalogo_andrea_botas_2020.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_off0000dfcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCD 5584 bytes
SHA-256: 65636a5504bfbbc56f61c1597dd7f099d14b4a4f119ac36a78ab4674e50a5e71
font_01_sfnt_off0000f2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BD 10492 bytes
SHA-256: d665f454f40671fe39d31602b417bc793223ca27208c4f2c74ed055e55f171a3

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