Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb818c36a45f7035…

MALICIOUS

PDF

82.0 KB Created: 2021-03-27 23:34:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2d4f21085e0609fd825eb3a7ff04be7a SHA-1: 84ff56dab3ff8812e864377430527b9a16f1d146 SHA-256: eb818c36a45f7035c0cf643834391ade38ea955f6916ec0a1f33a4b04b0821a3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://jumiwimov.ru/award?keyword=a+view+from+the+bridge+pdf+arthur+miller PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414164/normal_602552ac07673.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379385/normal_604d19ca5147e.pdfIn PDF document text
    • http://bakugutujom.22web.org/59891314836.pdfIn PDF document text
    • http://ersoil.fun/51285599860h0c3q.pdfIn PDF document text
    • http://kufowawixapiva.sportsontheweb.net/contoh_soal_dan_jawaban_persamaan_dasar_akuntansi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457560/normal_5fc7333707ce1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485322/normal_604cef207c0b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365591/normal_603e24e46acc1.pdfIn PDF document text
    • http://honey-love.ru/95349206556nk1tn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494661/normal_601574e8e7274.pdfIn PDF document text
    • http://lubenoredeji.mypressonline.com/31209528382.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470962/normal_605ab710a6b13.pdfIn PDF document text
    • http://tonevagewalilu.medianewsonline.com/tankless_hot_water_heater_rinnai_reviews.pdfIn PDF document text
    • http://xudiremomikuxe.iblogger.org/excel_vba_array_variable_type.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7fca5364-97a1-4441-b76e-d2c429a59218.filesusr.com/ugd/735424_8888c27c20514b6c9aa2ecbf54679d26.pdf?index=trueIn PDF document text
    • http://fafinonez.rf.gd/article_13_movie_song.pdfIn PDF document text
    • http://xejobutek.onlinewebshop.net/mipotelukanoruw.pdfIn PDF document text
    • https://3e1ae61b-6b68-46dc-8a90-d1c7a5b9f91c.filesusr.com/ugd/b8bbd7_ca064633947a4d2c81769df800d3309f.pdf?index=trueIn PDF document text
    • https://c81c1a69-aec6-471c-ac34-7a6800eafc69.filesusr.com/ugd/9ef1ea_5034162f52a04e1b8dc24fa8ee919336.pdf?index=trueIn PDF document text
    • https://3437305d-a3f4-4f94-9a63-846dd410f5be.filesusr.com/ugd/ffe76b_4d7244c74a564cffb2fdf14672c20c73.pdf?index=trueIn PDF document text
    • https://034618a9-9b39-4f41-ad18-95bca1d1c80b.filesusr.com/ugd/48d9a1_c9c596e5381644beaa812cab13addf5d.pdf?index=trueIn 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_off000102d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D0 5560 bytes
SHA-256: 52926e994b662f75fc5ec59c89a03ad3d892727c9b88cdd8b77dc0001a3f4568
font_01_sfnt_off000115a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A1 10788 bytes
SHA-256: 643dd78ae58df6ef287dd25ac40fe5710259dc2e6acaa8d66b2724378b1ef54f

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