Malicious PDF — malware analysis report

Static analysis result for SHA-256 78e26c0649e772c2…

MALICIOUS

PDF

117.1 KB Created: 2021-01-28 11:32:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 23941407ded152a74ab3f9a530e01ac7 SHA-1: 9abb41b85e430d9cdee840d2bcf48d7fa6b71879 SHA-256: 78e26c0649e772c2ffc511bb9342ee1f42e47b3f173f914bd45a5fedbde63e91
126 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lead users to further malicious content.

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://jottigo.ru/aws?utm_term=neumonia+adultos+pdf+2018 PDF link annotation
    • http://firstsecu-paypal.com/jinubukewujivepirozipr2rbb.pdfIn PDF document text
    • http://datinge.site/requisite_organization_elliott_jaquesktbfz.pdfIn PDF document text
    • http://naturaitalia.space/174150430781smxu.pdfIn PDF document text
    • http://triple-doska3.club/falling_for_christmas_movie_filming_locationmlwb4.pdfIn PDF document text
    • http://tuimag.ru/nursery_rhymes_lyricso6uzj.pdfIn PDF document text
    • http://momentshop.website/xbox_series_s_amazon_prime_day18i6o.pdfIn PDF document text
    • https://sotemupavunu.weebly.com/uploads/1/3/1/4/131413148/0f8e083f6549b.pdfIn PDF document text
    • https://xasedomag.weebly.com/uploads/1/3/1/0/131071243/c7d167aba37.pdfIn PDF document text
    • https://pogosarixuxa.weebly.com/uploads/1/3/0/7/130776079/4b9379970fd3.pdfIn PDF document text
    • https://lisufijefe.weebly.com/uploads/1/3/2/7/132740260/8dbbbe7.pdfIn PDF document text
    • http://kukushpa.fun/watch_south_beach_tow_free313og.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/personal_budgets_templates_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/the_beatles_compilation_albums.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/1440415249.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_off00018e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E47 5580 bytes
SHA-256: 6ee45319e215f148240d52f7d7bbc62f053452df45c848f0d9104ac98826bd0d
font_01_sfnt_off0001a138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A138 11396 bytes
SHA-256: 9de33a6eadb19e843f9b18b7ced9b022803f1ab7f82317400f22fff7e2dbb0c3

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