Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b174169d58437f3…

MALICIOUS

PDF

89.8 KB Created: 2021-03-31 01:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a9a9e90495bad5f52c356fbe23bdbf7d SHA-1: 5ba9d003d1e59950ebed3b0a5bf4a258bc4ba6a3 SHA-256: 8b174169d58437f3f64d0e76334e5e40294b4d3fac99d5f260cc199ec8fe478d
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to 'baarspo.ru', a domain flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/award?keyword=impact+of+globalization+on+african+culture+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418579/normal_602ebd145a9a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418968/normal_6058f30bc15e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454541/normal_5fd1d1ab949c9.pdfIn PDF document text
    • http://eyebrowthreadingdallastx.com/xitulibivekuxilon9q6e.pdfIn PDF document text
    • http://islandlandscapesbb.com/940141733409lttv.pdfIn PDF document text
    • http://evatopshop.xyz/84430249640ghlnv.pdfIn PDF document text
    • http://copalofa.site/16094863593scvp1.pdfIn PDF document text
    • http://chambrely.xyz/474230162235evh4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408595/normal_5fed695ce3064.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366008/normal_60425ea383dba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377400/normal_5ffb1d040a7e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408875/normal_604f04b8b1f03.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cd4a8f2-9136-4c67-ab5a-da632700aa53/when_have_you_broken_the_rules_interview_question.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de834714-e8fa-4c58-9bd6-c393a62de6dd/rujoradamiwikupowapupibom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eeddb2a5-eee8-44b2-94b5-7e6f21c8c5be/88627872390.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/3686725712.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47937fb3-ef57-4b87-bd68-25288ebd577a/pibipidaweje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb62047b-9aca-4c38-9f21-2fa728afa06a/lewis_howes_the_school_of_greatness_book.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/hilton_onq_api.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b196e824-685d-46d2-96f8-79f8b57db805/insinkerator_badger_5_leaking_from_side.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/clothing_inventory_spreadsheet_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86cca625-ec68-4b87-a72b-373f5f15cf44/gibuwivulesuviluvusadidi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb16b37d-4a80-42a1-891e-b572f326089f/63696969816.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/airline_tycoon_deluxe_apk_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3d90fc5-63cc-406e-af06-2bd448a6b902/tibekisufag.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/tabla_de_verbos_en_ingles_irregulares_y_regulares.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_off00011fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FED 5424 bytes
SHA-256: 4d722b12e77e888d7a83e8c737686e565c3281a68c8f249d48056879229a2286
font_01_sfnt_off0001324c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1324C 11292 bytes
SHA-256: a4395cec896274c0ef78761f2e796996febf7650ce54e8caa89c1485a4a438ef