Malicious PDF — malware analysis report

Static analysis result for SHA-256 87643969d2ef55f9…

MALICIOUS

PDF

73.5 KB Created: 2021-04-03 19:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 03b2f7641e6d645f7b0bb186ff917f3f SHA-1: e82046c28c52e5bb79e81376994797973cce1357 SHA-256: 87643969d2ef55f9fcf3b97e991c827d4f4335c91de82846fcc538f0b6ee3eef
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, identified as a link farm on disposable hosting, with a primary malicious URL pointing to 'gimoguvi.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and embedded URLs suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://gimoguvi.ru/strik?utm_term=types+of+mining+in+zambia PDF link annotation
    • http://topplafond.xyz/how_do_you_write_a_catalyst_in_a_chemical_equation7zrvz.pdfIn PDF document text
    • http://liko-sneakers.com/xixarupisp3q8p.pdfIn PDF document text
    • http://zogasukod.22web.org/87381416969.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_4b041d14989a463d99580022a40e7979.pdf?index=trueIn PDF document text
    • http://walofasokim.epizy.com/leadership_theory_and_practice_northouse.pdfIn PDF document text
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_9ecf457e5e474923b0d2350f5ef1e62b.pdf?index=trueIn PDF document text
    • http://zazoruwokabaj.rf.gd/ruxuzakonut.pdfIn PDF document text
    • http://semedefarewunoj.rf.gd/data_structure_and_algorithm_multiple_choice_questions_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/leropavetakorofif.pdfIn PDF document text
    • http://ligirewela.epizy.com/11065187882.pdfIn PDF document text
    • http://mavowidigusuj.rf.gd/verizon_fios_tv_plans.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e790a31-35be-494e-bd2d-fbd1d586ba89/thank_you_mandarin_xiexie.pdfIn PDF document text
    • https://87098103-4d08-48bb-90a6-807b0ef734b2.filesusr.com/ugd/1f49de_b8fcf0eb09884c20a7641512352481c0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d28cdf6-4f89-4742-90e6-536e15f09952/the_expanse_books_vs_tv_show.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78ecf291-1d80-406d-b77f-39ed0feafe27/batezowesigowafa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e02d1e9-c8b4-4f82-92f8-0bc9f4891df0/where_does_the_water_filter_go_in_the_keurig_k_supreme_plus.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/coloured_acetate_sheets_for_dyslexia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d641125-26d6-4549-8a35-e653f81ea7fd/22885999838.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_off0000e0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C5 5332 bytes
SHA-256: b13c229f0a27499ab121b68e0ad3232e2fbdc06764a6d8df4573959b834b71c6
font_01_sfnt_off0000f2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2ED 10840 bytes
SHA-256: defe99b1e2f4b65531924dea1a8ceb05864ae2c2f0e46913a24ff88911d44bce

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