Malicious PDF — malware analysis report

Static analysis result for SHA-256 4668ae2769c1a1e6…

MALICIOUS

PDF

89.5 KB Created: 2021-03-20 06:24:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 01fbddffa848e8419a8c742237654234 SHA-1: 32e606bed940140e6f93aa4c09ee01797f8f5217 SHA-256: 4668ae2769c1a1e687394ea35a0efe2a6aa20900a6bbd1c01fe15de815945443
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to exam questions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/award?keyword=entrance+exam+questions+for+class+11+science+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370762/normal_60307279314d7.pdfIn PDF document text
    • http://pinerapidsrr.com/the_advisor_playbook_summaryc31o1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408596/normal_604a634889963.pdfIn PDF document text
    • http://deutschebank-meine.com/mofarajosoxopaladafakep9uk9a.pdfIn PDF document text
    • http://betijeduw.getenjoyment.net/44779509231.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450638/normal_6037b9afd623c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486537/normal_5fd822bfe9b2a.pdfIn PDF document text
    • http://instapresent.site/mukitoviro6lhnn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448720/normal_601bf9146eb27.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9a4203bb-6ff2-4ef1-9c63-3f113f84a884.filesusr.com/ugd/ea9bdf_3f5429d4ef5145ef86dd1fc2d09974fb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2142265f-d7ba-4a58-812c-ceb916a7ec3e/princess_diaries_3.pdfIn PDF document text
    • https://18b09f4e-de4d-4c1b-9fe6-be55c63b1c00.filesusr.com/ugd/cd81e9_7d11d8238b044363ac5f5f72e0d0b82a.pdf?index=trueIn PDF document text
    • https://d6236f05-450e-4b96-9875-1783d83c708b.filesusr.com/ugd/912de2_04bf10a958914b52af1d4152dc202a7d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jobavo/92748651601.pdfIn PDF document text
    • http://rixigor.onlinewebshop.net/87862506693.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/how_to_use_lg_convection_microwave_for_baking.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/custom_forms_carbonless_pictures.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/dasatomusupetelav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2e778b1-b0c6-45c2-b766-586a702eb2e3/3838774212.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_off00012031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12031 5504 bytes
SHA-256: 4b69be7e64dd261ff4e15f5572e54cbffd7566d82673419c196381ad38259631
font_01_sfnt_off000132dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132DD 11280 bytes
SHA-256: e8096fd1e8a338ae3ace39da7b0c87a29e3d49d292fc01d7dd88670ad811588a

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