Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfe08a4de7dc0656…

MALICIOUS

PDF

86.0 KB Created: 2021-03-22 02:49:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 55acf7e389edfdef2e748f6de0d7e4ea SHA-1: 62c5c0daa6a6cee3456c96dce77d4d653b85f4d0 SHA-256: bfe08a4de7dc0656f644d9970a5e710ed8f15ccd457d57a78c4c6736e9104c06
146 Risk Score

Malware Insights

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

The PDF exhibits characteristics of a link farm, hosting numerous links to other PDF files, many of which are hosted on disposable domains. The presence of a malformed exploit stream and ML classification strongly indicate malicious intent. The embedded URL 'https://leonvi.ru/award?keyword=artocarpus+altilis+pdf' suggests a potential phishing or malware distribution vector, likely aiming to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://leonvi.ru/award?keyword=artocarpus+altilis+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4419206/normal_5fef419ad9068.pdfIn PDF document text
    • https://cdn.sqhk.co/nowonipewo/gho6jhJ/free_woodworking_plans_for_outdoor_tables.pdfIn PDF document text
    • http://gezudozu.iblogger.org/hnbgu_b._ed_exam_form_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461485/normal_5fdeb9a436fb9.pdfIn PDF document text
    • http://nonowun.mywebcommunity.org/sony_dcr-sx22e_price.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489057/normal_603a72c03e4ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383798/normal_60579b0529603.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448330/normal_5ffcae1a97cae.pdfIn PDF document text
    • https://cdn.sqhk.co/nazutupim/jb99Fx9/387161386.pdfIn PDF document text
    • https://cdn.sqhk.co/gunakawujo/hAhaw21/jexulumifiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413236/normal_6036a0833027a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461746/normal_600ba9c42263d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412161/normal_6036d7decfdda.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/38dc8654-6e3f-48cb-bb38-fb78c8b5b5ec/12694578291.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ead897e-ee76-475a-ac78-aa554ad82761/gerobadedupazu.pdfIn PDF document text
    • http://tibibexubedumu.rf.gd/zazawutalokupigijaxira.pdfIn PDF document text
    • http://megigezorozo.atwebpages.com/bilanzkennzahlen_formeln.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/122bb1da-2880-450f-aca9-d1c5650cac34/nenomegevem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4284862-5a57-40b3-85e7-6501e4486bf7/why_my_frigidaire_microwave_stopped_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2126698f-f9d3-4801-b5c9-0b9a81688443/the_second_step_in_the_decision-making_process_is_identifying_a_problem.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_off00010fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC1 5140 bytes
SHA-256: 058938d8f32efe7d335327ec7b448cbe3d301a6bec6f388c11ea95d14ff74068
font_01_sfnt_off0001214b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214B 13224 bytes
SHA-256: c7170ca3227bc75cbb0336a51a026b5c4ab5e3bc081cfeeab4d1d7ed68c156dc

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