Malicious PDF — malware analysis report

Static analysis result for SHA-256 955eb5e5ffa7cfdc…

MALICIOUS

PDF

75.3 KB Created: 2021-03-03 06:55:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 3a001823ab1084e7c78ba48eb1839c5a SHA-1: 258607c8811adba518ddec87f05fd44db060055c SHA-256: 955eb5e5ffa7cfdcc0702bc66ed1391d31bc8e22ee834db892c0e674b3a2a360
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with several pointing to disposable hosting and potentially being used for SEO poisoning or phishing. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags the document as a link farm on disposable hosting, reinforcing the malicious nature.

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://golowaki.ru/wix?keyword=vw+golf+tdi+manual+transmission+for+sale PDF link annotation
    • http://sevezor.scienceontheweb.net/remington_700_bdl_30_06_synthetic_stock_for_sale.pdfIn PDF document text
    • https://vusukiziroge.weebly.com/uploads/1/3/0/9/130969505/6500390.pdfIn PDF document text
    • http://xevidome.iblogger.org/staples_8_tab_dividers_template.pdfIn PDF document text
    • http://tonedomopoja.scienceontheweb.net/universal_remote_code_for_toshiba_tv_dvd_vcr_combo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478414/normal_6034df7775d9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466659/normal_601e885be5f7c.pdfIn PDF document text
    • http://giwapozolaleg.mypressonline.com/how_long_is_maternity_leave_in_illinois.pdfIn PDF document text
    • http://beririka.scienceontheweb.net/54945844010.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447253/normal_6019798d67ac1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/carcinoma_escamoso_de_cervix.pdfIn PDF document text
    • http://bugelinuxobeva.epizy.com/zutabozagulakavopok.pdfIn PDF document text
    • http://kidereludabiron.epizy.com/personal_capital_investment_performance.pdfIn PDF document text
    • http://safedoguno.onlinewebshop.net/zmodo_h.264_dvr_network_setup.pdfIn PDF document text
    • http://maviwapas.epizy.com/40056204081.pdfIn PDF document text
    • https://s3.amazonaws.com/natewared/compare_numbers_kindergarten_worksheets.pdfIn PDF document text
    • http://gamutazuzores.epizy.com/como_la_flor_violin_sheet_music.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_off0000e8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C0 5284 bytes
SHA-256: 886be4c142d7891f0d085307b163aedf73ca0e043b34d0f92002387547343fd8
font_01_sfnt_off0000fab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB7 10920 bytes
SHA-256: ca07699701efe185172ecbe93ff673f1f4d58afe5449b7b3ca5b3604a0c73cea

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