Malicious PDF — malware analysis report

Static analysis result for SHA-256 81f8448887dea360…

MALICIOUS

PDF

96.1 KB Created: 2021-03-19 23:30:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a2436cb0f3483ea333533eb4bf039213 SHA-1: 6f0ce12e69d976db528a1f8832eb4c4c294d73a2 SHA-256: 81f8448887dea3602a6dc0ac5951d77b7e23a143ed0869fe7b2d1ed99c525222
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains, suggesting a phishing or link-farming attempt. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a high number of links to distinct, disposable hosts. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://leonvi.ru/123?utm_term=que+es+anemia+de+c%25C3%25A9lulas+falciforme PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402953/normal_601f00535a486.pdfIn PDF document text
    • http://usacreditcheck.info/vba_word_search_and_replace_stringrws3l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490515/normal_602944915cf0e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460473/normal_5fdd2ff8d33a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408184/normal_60136a5a13861.pdfIn PDF document text
    • http://newsportstechnology.ru/lazibibilumoxuwesara50oo6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389352/normal_6031e5751852e.pdfIn PDF document text
    • http://boldly-grow.com/hcc_affirmation_of_residency_form_onlinej8pos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423454/normal_5fff250de6fdc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465400/normal_5ffd8639767de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478669/normal_600d881e32ad0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367960/normal_5fe570080920a.pdfIn PDF document text
    • http://bachanalytics.com/braun_series_3_340s-4_replacement_foil_bootsifkpq.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/fbc2f562-0dcf-4a57-bf55-11b3f1023694/an_introduction_to_language_11th_edition_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bfac624-141c-4588-ade0-ff6a46e66d97/bissell_healthy_home_vacuum_brush_not_spinning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3614c3e6-5039-4bc7-b0ed-caa3921d0ea1/what_can_be_done_about_parental_alienation_in_texas.pdfIn PDF document text
    • http://pibubirokur.rf.gd/cessation_nation_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/c5_window_envelope_letter_template.pdfIn PDF document text
    • http://juwebud.epizy.com/76810885750.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/candlewood_lake_fishing_reports.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21835063-8c59-4254-8468-8247ab92bbb6/who_are_the_three_most_famous_renaissance_artists.pdfIn PDF document text
    • http://delisomujiroma.epizy.com/90037251044.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_off000138da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138DA 5368 bytes
SHA-256: 25f5ba0462b977e29a6a1e16727deb220bf8cbf486da7259a87757fc1993a7d6
font_01_sfnt_off00014ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AC4 11792 bytes
SHA-256: af16e811d3838ddc3db7cfa1d1c79586d838fcb8676561a3a15359e7a63ea2b2

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