Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ae93caebeb182dc…

MALICIOUS

PDF

83.0 KB Created: 2021-05-16 02:20:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 60238c58849af732267e308e96cfb0c4 SHA-1: 10c2af22b9dafc6aebe8a280ed46e3abf68ac21f SHA-256: 4ae93caebeb182dc87c1778bfa25e55f96c94d0ff14767114e19ea735ccf257a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users to potentially harmful content. The presence of `utm_term` parameters suggests a phishing or social engineering lure, aiming to trick users into visiting these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/strik?utm_term=worshipping+false+gods+in+hindi+pdf PDF link annotation
    • https://cdn.sqhk.co/nazopekujavi/iSrXhjk/nugixowujavamutota.pdfIn PDF document text
    • http://lotibamuzuti.scienceontheweb.net/avadhuta_gita_sanskrit.pdfIn PDF document text
    • http://vovality.club/34244260822dbw1r.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421937/normal_5fed2aa754815.pdfIn PDF document text
    • http://vykupavto54.ru/432598740557rwn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367940/normal_60149e72b8693.pdfIn PDF document text
    • http://pojebanidik.mywebcommunity.org/centrifugal_pump_specifications.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446289/normal_603e5ced4aad2.pdfIn PDF document text
    • http://luwogexejel.getenjoyment.net/what_does_captivity_mean_synonym.pdfIn PDF document text
    • http://firstflirts.site/bimisijiniboxudulodiu4s93.pdfIn PDF document text
    • http://nadefememidep.medianewsonline.com/cengage_chemistry_book_download.pdfIn PDF document text
    • http://instas.site/how_to_fix_a_panasonic_microwavef0qz1.pdfIn PDF document text
    • http://zuzorovix.scienceontheweb.net/vetitib.pdfIn PDF document text
    • https://cdn.sqhk.co/xewimoziwuvo/evVzTib/78954404711.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488137/normal_603e7b2a89b0a.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/496e55b7-c4ef-44e1-b5d9-4305b61fd822/vizio_smartcast_38_2.1_sound_bar_system_sb3821-d6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/935258f8-6748-4a30-a834-0a3cf7b719ed/buku_manual_kenwood_tm_261.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a6e4688-df0b-44e8-acc3-18624a2633ff/how_and_when_to_review_the_written_health_and_safety_policy_statement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4d6a578-6c35-49a7-a423-09fc3af5b530/pipukezer.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF141 5316 bytes
SHA-256: f98138243cdf61293b68620b50c6e13467d31b08226fa4c5fdc43eacee3383a0
font_01_sfnt_off00010362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10362 10416 bytes
SHA-256: f74c2683a282010ce959e559ac5756ec8da90c1c2bbfba65702721c898fa6120
font_02_sfnt_off0001273c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1273C 16164 bytes
SHA-256: e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6

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