Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fe9a4f5cb85e816…

MALICIOUS

PDF

79.1 KB Created: 2021-03-03 06:56:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2dba49be173a9a87e0563481d2fa2cb7 SHA-1: 50bcdf37b2872359682d04ca24f11b625e15d460 SHA-256: 4fe9a4f5cb85e816dc0f71717fded3a174293f3ee8c2b1d8242930ed7be1bd56
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 0.9996

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://jacksth.ru/123?utm_term=watch+house+of+spirits+full+movie PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417805/normal_6031df991f88f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492900/normal_60241e6943f0c.pdfIn PDF document text
    • https://redojakora.weebly.com/uploads/1/3/2/6/132682723/besuwudomunoxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410722/normal_60133a9e99c5f.pdfIn PDF document text
    • http://xikumidevulofo.iblogger.org/67971299221.pdfIn PDF document text
    • https://katabeguravaka.weebly.com/uploads/1/3/1/4/131407194/7831906.pdfIn PDF document text
    • http://totumaxotudi.iblogger.org/stephen_king_books_to_read.pdfIn PDF document text
    • http://menajaf.iblogger.org/capitulo_1_como_somos_vocabulario_1_answers.pdfIn PDF document text
    • https://samalatedagunir.weebly.com/uploads/1/3/4/0/134040677/4186236.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tunajuxogililog.epizy.com/live_stream.pdfIn PDF document text
    • http://rododibez.epizy.com/3201581672.pdfIn PDF document text
    • http://lujotuxubegu.rf.gd/angular_6_dashboard_template_free.pdfIn PDF document text
    • http://fapabuzoliwesaz.epizy.com/fitom.pdfIn PDF document text
    • http://sokutuwinal.epizy.com/81699012103.pdfIn PDF document text
    • http://genobobef.rf.gd/the_brief_wondrous_life_of_oscar_wao_sparknotes_chapter_1.pdfIn PDF document text
    • http://xofukadebinomo.epizy.com/google_cardboard_camera_apkpure.pdfIn PDF document text
    • http://poziluxolebulu.epizy.com/19188546665.pdfIn PDF document text
    • http://sogisujomixugo.epizy.com/tizugukeforuruwabifovanuk.pdfIn PDF document text
    • http://vebadanu.rf.gd/movemu.pdfIn PDF document text
    • http://walevuzu.epizy.com/gorilla_my_love_characters.pdfIn PDF document text
    • http://bipodolekade.rf.gd/husky_2200_psi_pressure_washer_manual.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_off0000f557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF557 5328 bytes
SHA-256: ec0012b8fadaa468c43802af1e74a699381407eaa94b7049b9d89d4ca3ace738
font_01_sfnt_off0001075e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075E 11300 bytes
SHA-256: c3cebf41ba0eab3b8576e723aea2aef1fc37d2d397561ab4de99b5b69a25fabd

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