Malicious PDF — malware analysis report

Static analysis result for SHA-256 f88fa3c623df3a31…

MALICIOUS

PDF

71.5 KB Created: 2021-04-28 22:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b88908c312ba71b3357c05cedb53da10 SHA-1: 288210255cf92c12297870a36db9a9f9687268d0 SHA-256: f88fa3c623df3a317b59ab223665c9f5ea7ae476948d51535bb846e0c885f294
126 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and is flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. The document body, though heavily obfuscated, suggests a lure related to 'seasonal variation in time series example' which redirects to a suspicious URL. The presence of numerous links and disposable hosting indicates a link farm used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/strik?utm_term=seasonal+variation+in+time+series+example PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484636/normal_6012973dc4822.pdfIn PDF document text
    • http://alexsaf.ru/brother_xl_3010_manualpdjwf.pdfIn PDF document text
    • http://tonedomopoja.scienceontheweb.net/10386518893.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425909/normal_60274b22786f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426682/normal_605d7d9687324.pdfIn PDF document text
    • http://hookup754.fun/59079586247zeq47.pdfIn PDF document text
    • http://vadosaj.getenjoyment.net/2nd_edition_dd_books.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478438/normal_6002b3633bb31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365638/normal_604d215adc7bf.pdfIn PDF document text
    • http://vavexefane.mypressonline.com/modern_auditing_and_assurance_services_5th_edition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468294/normal_6043257b6c5de.pdfIn PDF document text
    • http://izzzaaa.space/39836544239rb84n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408993/normal_5fef4c07e6f25.pdfIn PDF document text
    • http://warupipujamoru.sportsontheweb.net/accounting_concepts_and_conventions_download.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/ceb67062-a6fa-4f47-b17e-105c05579837/ford_mustang_convertible_price_in_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/731ffb61-4cee-4559-9b22-04e610e46173/db2_sql_statement_syntax_rules.pdfIn PDF document text
    • http://lavisekenesavof.myartsonline.com/73933652775.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4907c26-466d-4546-bfce-6220e5956fe3/83271884453.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55ceb6db-1933-4548-b3cf-0f0deed8440a/how_to_get_a_free_ti_84_calculator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f0839f2-bc18-4316-8b2e-d9f22d023d74/what_computer_language_pays_the_most.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/589aebc7-e4f6-4188-99a6-ee3b1c8b5983/how_do_i_change_the_time_on_my_pebble_watch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3c2efca-ca03-49db-ae43-f1b39ee1aecf/39604473107.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea88a68e-cb6b-42d3-b813-db2f4eeba62d/97719839149.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_off0000da22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA22 5196 bytes
SHA-256: 9b1bd9c7fa78bcabeca93e1b00ec292d17f8974e6a29506e495493700a39069c
font_01_sfnt_off0000ebbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBD 10752 bytes
SHA-256: 868e1fa5b461dbf456c78a9b5b26ab6a58b4ab389c80cccbb8cc0354148c2520

Open this report in the interactive analyzer, or submit your own file for analysis.