Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd1aaf146cc2f2ca…

MALICIOUS

PDF

70.6 KB Created: 2021-03-18 08:03:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 891dae00ed7ee1b4708e4ea66dbee2f7 SHA-1: 93eb9a9aab86b07b964a2d54a52449b135235590 SHA-256: cd1aaf146cc2f2ca720d9c2deed910ad36282a8353a087aff4268a8b843c9163
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/123?utm_term=implant+surgical+guide+planning PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4391009/normal_5fcac1f259581.pdfIn PDF document text
    • http://zitojesudesidaj.22web.org/91136531992.pdfIn PDF document text
    • http://gazzsheff.xyz/the_amityville_horror_1979_moviectydo.pdfIn PDF document text
    • http://kugiriteno.iblogger.org/envasado_de_los_alimentos_en_atmosfera_modificada.pdfIn PDF document text
    • https://berekiba.weebly.com/uploads/1/3/1/4/131482976/sazevifodesepiw.pdfIn PDF document text
    • http://instapodarok365.site/what_is_meant_by_power_dissipationmgxjn.pdfIn PDF document text
    • http://benunemubowam.22web.org/what_is_coming_to_netflix_in_march_2021.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379968/normal_5fe46fd948ac7.pdfIn PDF document text
    • http://ch-bewertung-2888.xyz/which_of_the_following_statements_concerning_evidence_is_truepo7sp.pdfIn PDF document text
    • https://benipotuwazel.weebly.com/uploads/1/3/4/4/134445242/rurodomasujup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447086/normal_60392134d8c6e.pdfIn PDF document text
    • https://wevuviwujito.weebly.com/uploads/1/3/1/6/131636984/dunarazufuvumuxu.pdfIn PDF document text
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/f67f308d28374d.pdfIn PDF document text
    • http://uaportal.site/what_do_you_read_in_ap_lit01m0d.pdfIn PDF document text
    • http://midazimika.iblogger.org/bokonuwemasegirepojivulok.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/6326457b-9ddd-47ab-b146-feb596df67ed/who_is_the_richest_shark_on_the_show_shark_tank.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbf4b34e-6ca4-43f6-9106-42c78cd67dea/vw_golf_mk4_automatic_transmission_fluid_type.pdfIn PDF document text
    • http://pemukusa.epizy.com/sql_server_2018_and_install.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce249ef4-44bc-4b1f-a1d2-db4709f568d0/lerumikinegiwijapupagese.pdfIn PDF document text
    • http://zezibinevuzeliw.epizy.com/human_psychology_101_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74d159af-1a5c-48b8-8864-59f5784d0a1c/elements_and_principles_of_design_matrix_worksheet_answers.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_off0000d709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD709 5328 bytes
SHA-256: 3575c97e5357f80c043f58ce263cee65a7013c41b14c5f287357b6eaaffe1e4e
font_01_sfnt_off0000e90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90C 10560 bytes
SHA-256: 61f056a75995966770f26ed05bf8940da090e7f2f1f75f8a411ddf9230320b45

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