Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0ebb4aae9c13510…

MALICIOUS

PDF

78.6 KB Created: 2021-06-02 03:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 97a19ab859b0c144f0dc68804d46fced SHA-1: 473c96d78a196b2b4aca192be1de1cea1ff03f9e SHA-256: c0ebb4aae9c13510ff27779e08123898fd5fcaf21327040e61808e0ebc3ce50d
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm, suggesting a phishing or spamming operation. The primary malicious URL identified is https://cructi.ru/pbw?utm_term=what+to+use+instead+of+buttermilk+in+red+velvet+cake, which is likely used to redirect users 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
  • 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://cructi.ru/pbw?utm_term=what+to+use+instead+of+buttermilk+in+red+velvet+cake PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386822/normal_60511a6369c03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456379/normal_603eb279d0e39.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://poxanoralanu.pbworks.com/w/file/fetch/144422034/text_features_first_grade_lesson.pdfIn PDF document text
    • http://sorawako.pbworks.com/f/kabhi_kabhi_film_songs_mp3_free_download.pdfIn PDF document text
    • http://bevojoluvu.pbworks.com/f/zoriwewisivodiveki.pdfIn PDF document text
    • http://mogulazedub.pbworks.com/f/lebajesinapukaxuwinebojat.pdfIn PDF document text
    • http://sofutikajen.pbworks.com/w/file/fetch/144456048/vazipajudoj.pdfIn PDF document text
    • http://jutifakukap.pbworks.com/f/11797593593.pdfIn PDF document text
    • http://nowefuro.pbworks.com/f/domain_search_shopify.pdfIn PDF document text
    • http://zizovitunex.pbworks.com/w/file/fetch/144482631/73007347087.pdfIn PDF document text
    • http://xojifot.pbworks.com/f/how_to_add_friends_on_switch_minecraft.pdfIn PDF document text
    • http://garifukedako.pbworks.com/w/file/fetch/144426039/madotowavase.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/220df493-6d3d-4a73-b695-65f0db0ed300/68384878588.pdfIn PDF document text
    • http://fepewuwakow.pbworks.com/f/21857216314.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8dfc369-0aee-4d11-b801-61b04fd8998f/dixie_chopper_xcaliber_4x4_reviews.pdfIn PDF document text
    • http://dipoziw.pbworks.com/w/file/fetch/144439533/31523713577.pdfIn PDF document text
    • http://liwuvedesisu.pbworks.com/w/file/fetch/144485172/geometry_dash_2.2_beta_apkpure_download.pdfIn PDF document text
    • http://vifogajo.pbworks.com/f/ict_scheme_of_work_for_primary_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04904a01-dfb6-4189-a7c6-c673d9da8395/kogemutewe.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_off0000e178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE178 5420 bytes
SHA-256: 3026fc2200ed16e629354d9f14ae0b8f71728416e2b8321aedea8909ffa0304b
font_01_sfnt_off0000f3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BD 12340 bytes
SHA-256: 68be8ae8dec01fe39670c24f3b05fae2d3f6a92e6c1e0d84e05e830bae2a4813
font_02_sfnt_off00011ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE7 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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