Malicious PDF — malware analysis report

Static analysis result for SHA-256 87df946a61711964…

MALICIOUS

PDF

117.2 KB Created: 2021-06-04 18:26:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2a259eefe1652f207b916da759df20ab SHA-1: bdc4d394f3ce869c798a62718184060311c2177c SHA-256: 87df946a6171196432eab25012e23cce60606b85e498590fcacc8684b7a366bb
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xajibur.ru/123?utm_term=bts+answer+love+myself+lirik+terjemahan PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4473947/normal_5fc90258a5c42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492536/normal_60482095bf8fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501027/normal_604a9d0ef18e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369331/normal_5fe35fc3c291a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/0786c77e-3815-4e79-abc2-60e7080cd9fa/dekawavumini.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/704d6055-27fe-470f-8c00-5e9d25d0c03e/estructura_del_texto_argumentativo.pdfIn PDF document text
    • http://jilawuxifi.pbworks.com/w/file/fetch/144549291/pulasumokakabogosifotup.pdfIn PDF document text
    • http://xutosop.pbworks.com/f/steelpix_stemming_machine_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f83bdc6d-7069-48cb-ad4f-5b3c28ee97a7/25204784176.pdfIn PDF document text
    • http://vibasuvezuz.pbworks.com/f/88398838703.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7549334d-094e-4f8f-a10f-def29f5789d8/what_is_michael_vey_prisoner_of_cell_25_about.pdfIn PDF document text
    • http://wuvebag.pbworks.com/f/financial_statement_analysis_and_security_valuation_5e_by_penman_s.h.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94b02373-4cde-4462-a189-8f20c5079ca6/how_to_calculate_nett_income.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3b1d21d-8b5a-426a-b2e1-17b9bfbd39c9/63420118737.pdfIn PDF document text
    • http://buluwogot.pbworks.com/f/kugenakowigodufozizivo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bad6d51-b16b-415e-b915-f06b246553ef/feminist_theory_books_to_read.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef0cffc7-1e07-483d-b133-b8890c02d93d/zajojetirurosesizilo.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001064b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064B 30248 bytes
SHA-256: 0626a10a7e6bef769643062fce97cbed979efe7ee7f3cb1e306349ddf96a3a76
font_01_sfnt_off00015bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BDC 5240 bytes
SHA-256: 48e78f6ef3af6728ebbc87acda6b9f169d3717a836baf188b994c39e0d3f6991
font_02_sfnt_off00016d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D92 2160 bytes
SHA-256: 1db55e6f6a2c23c0aff9dc6a3d67e324c8a1d4a22104c35396e452b5e9e2dd1f
font_03_sfnt_off00017770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17770 11892 bytes
SHA-256: 03fd2c675837c7f03602997ad2445239717840db9ef3117af37425f53a678084
font_04_sfnt_off00019fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19FC1 17060 bytes
SHA-256: f20931c8d2f1fd9cf66b7cca6cdd473f0861006333438be909882b2742d442f6
font_05_sfnt_off0001b853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B853 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333