Malicious PDF — malware analysis report

Static analysis result for SHA-256 c14440c77f819b36…

MALICIOUS

PDF

76.7 KB Created: 2021-03-17 19:22:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 365decf950380b2e6e21ec87e13814a9 SHA-1: 25c5bc157c2ea65ae660609336078a906d708ae1 SHA-256: c14440c77f819b368805dc093eaa674d4657eda9b03ffcd115c355fdd1b23227
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, including one that appears to be a phishing lure related to 'antihistaminicos y lactancia pdf'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. No scripts were extracted from this sample.

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://midufefew.ru/award?keyword=antihistaminicos+y+lactancia+pdf PDF link annotation
    • http://bawimip.sportsontheweb.net/what_to_do_if_post_office_lost_package.pdfIn PDF document text
    • https://cdn.sqhk.co/fupupusamun/1s2jfgi/28017724296.pdfIn PDF document text
    • https://cdn.sqhk.co/wivenute/jjheXhb/baseus_encok_a02_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/tedubifo/su0VZif/dikatakasobegerudep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fasujenijasezos.rf.gd/golden_state_warriors_injury_report_today.pdfIn PDF document text
    • http://tumewadeb.epizy.com/anaconda_3_movie_mp4.pdfIn PDF document text
    • http://silirik.rf.gd/baaghi_full_movie_free_mp4_2016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab410e30-3859-4677-b7e3-f139f2273954/59669550982.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75711d06-db0e-4435-bd45-1d5dffebf673/46190787725.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7aa7ce0-54d0-47c1-be8e-214e81a36d76/intex_sand_filter_and_saltwater_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c16a9db-31f7-4605-a514-9340985bc9af/dapple_weiner_puppies_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb316211-a1a3-471c-9148-9b8be2468236/propaganda_edward_bernays_turkce.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68abb245-1613-44bb-aaa9-926d0fa1e7f4/who_are_called_as_ethical_hacker.pdfIn PDF document text
    • http://bajekixizosi.myartsonline.com/what_is_a_digital_asset_management_system.pdfIn PDF document text
    • http://maxeses.rf.gd/lufeposizosime.pdfIn PDF document text
    • http://tifofev.rf.gd/67946081592.pdfIn PDF document text
    • http://muvegeposobaxog.rf.gd/gcse_chemistry_ccea_revision_book_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_off0000ea56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA56 5392 bytes
SHA-256: 976d41be06ba85f60a2cf2984148f04bc4aa7930346d8da71ddd3765e803f18f
font_01_sfnt_off0000fc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9C 12248 bytes
SHA-256: 379905ce131b3d305183afbc65b9b54e21bd08cf06e3e9dbc6baff61a5035bd4

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