Malicious PDF — malware analysis report

Static analysis result for SHA-256 f53cd5e6a34f41b6…

MALICIOUS

PDF

168.3 KB Created: 2021-06-08 18:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8cf39129d42e7c6dba0dee7d888e5786 SHA-1: a886c52e5b77367ca7e7eb79a5e8709662563a20 SHA-256: f53cd5e6a34f41b6cd3919d719bbbb0f57debbe6d50199001b3e2af45cda8cdb
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The document contains numerous embedded links, many pointing to disposable hosting services and employing UTM parameters, suggesting a link farm designed to redirect users to malicious sites. The primary malicious activity observed is the embedding of external URIs, likely intended to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://coretry.ru/pbw?utm_term=sword+art+online+war+of+underworld+episode+18 PDF link annotation
    • https://bogogumufen.weebly.com/uploads/1/3/4/0/134018830/1250415.pdfIn PDF document text
    • https://momaduse.weebly.com/uploads/1/3/4/8/134895420/c870817c88853.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391024/normal_5fdc356f0fd1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457330/normal_5fdb16b7339e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466140/normal_6017119a7ead2.pdfIn PDF document text
    • https://zabapekiji.weebly.com/uploads/1/3/4/4/134470890/zagoporomajifinawuta.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426822/normal_60174fa25cbfb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476768/normal_5fe673a3a58da.pdfIn PDF document text
    • https://vutadatibanol.weebly.com/uploads/1/3/4/8/134883393/9468170.pdfIn PDF document text
    • https://tasukivokojut.weebly.com/uploads/1/3/4/5/134592673/sarube_zixurikojo_musumukosuwaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mujefapufefi.pbworks.com/f/analisis_psicologico_de_la_pelicula_frozen.pdfIn PDF document text
    • http://fupimogevif.pbworks.com/w/file/fetch/144729402/74357841950.pdfIn PDF document text
    • http://mapaduzipi.pbworks.com/w/file/fetch/144506421/balazafu.pdfIn PDF document text
    • http://jesababa.pbworks.com/w/file/fetch/144414753/satyanarayana_swamy_vratham_pooja_in_telugu_free_download.pdfIn PDF document text
    • http://zikasamu.pbworks.com/f/bodybuilding_training_program.pdfIn PDF document text
    • http://beratirupo.pbworks.com/w/file/fetch/144559575/nafikujo.pdfIn PDF document text
    • http://xuwajesorewo.pbworks.com/f/how_to_end_a_month_to_month_tenancy_bc.pdfIn PDF document text
    • http://mulasamesi.pbworks.com/w/file/fetch/144575973/hastens_beds_price_list_uk.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_off0001d0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D0EC 44792 bytes
SHA-256: e0ec28bfb53d6c61c62849f71495898a63dea1d463b3ff8ee9cb81d6487eb254
font_01_sfnt_off000259ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x259EC 5476 bytes
SHA-256: 7dcf3f21a676b39fafce13739f55e6fb5f2f1b8bd68d7fb0fccebfd8abef5929
font_02_sfnt_off00026cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26CB0 11712 bytes
SHA-256: 81789d112df9f97efee6ef3d9b08903311f64151f3bdb5118a4090b5c89992c9

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