Malicious PDF — malware analysis report

Static analysis result for SHA-256 5263f89f90113cbd…

MALICIOUS

PDF

76.7 KB Created: 2021-04-03 01:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 81462219bd0b8991e8c42111f979ae69 SHA-1: dee6331fb44487a6df1ebec2777cf89d1b08587d SHA-256: 5263f89f90113cbded8253ef4e6dcdc1431c03e8d6333e3268fa794d84535bfe
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing campaign. The document body, though heavily obfuscated, contains references to essay writing, potentially a lure for users seeking information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/strik?utm_term=what+is+a+good+way+to+start+an+essay+about+yourself PDF link annotation
    • http://zafugot.22web.org/jusajaputevenofivulod.pdfIn PDF document text
    • https://janogawe.weebly.com/uploads/1/3/0/7/130776821/susutuvusazote.pdfIn PDF document text
    • https://fibumexil.weebly.com/uploads/1/3/1/0/131070733/c17ca1195d86.pdfIn PDF document text
    • https://fivosegexaf.weebly.com/uploads/1/3/2/6/132683078/lisudof_rodum_popoxo.pdfIn PDF document text
    • https://cdn.sqhk.co/goberirud/Lgdhede/63731604552.pdfIn PDF document text
    • https://zalefukonu.weebly.com/uploads/1/3/4/3/134346034/b33636a0e6421d9.pdfIn PDF document text
    • https://temabodanifow.weebly.com/uploads/1/3/1/4/131454916/67dcf262a535.pdfIn PDF document text
    • https://cdn.sqhk.co/moturalogupe/Mpbicig/9481471078.pdfIn PDF document text
    • https://vofirojaj.weebly.com/uploads/1/3/1/6/131637635/1939764.pdfIn PDF document text
    • https://cdn.sqhk.co/xenaporo/bTNnmQ1/58905799050.pdfIn PDF document text
    • https://cdn.sqhk.co/fagaxirupunu/NjcQjdx/monzo_digital_model_builder_apkpure.pdfIn PDF document text
    • http://midekupe.22web.org/appearance_vs_reality_hamlet.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/31904228-38e5-464e-858a-df6996a903d6/38162184011.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/aane_wala_pal_mp4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d30635ad-7613-4166-acd2-1697b0b17cbd/keradobo.pdfIn PDF document text
    • http://sobogasitizi.epizy.com/free_bar_menu_templates_for_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b739d20e-f948-4ecc-80cc-7fd6faa07a9f/how_to_connect_cricut_expression_2_to_computer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd94f0ee-3b98-4420-b781-b11264053031/reznor_unit_heater_parts_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/the_canterville_ghost_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/pencil_drawing_techniques_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/37209877020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9317f46d-a686-4dc7-998b-c148cb31ce8a/64773794437.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_off0000ed69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED69 5516 bytes
SHA-256: 97cb082bd7d1e544820780faaa674d709c8d16de2d8f6788ed1e8e9634d70ce5
font_01_sfnt_off00010042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10042 10808 bytes
SHA-256: 5f8b43ae614088e2c1865c94cdb20baeb243d127c0264bf3b32f314cf3fb3720

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