Malicious PDF — malware analysis report

Static analysis result for SHA-256 63ffb9ae28f9dc84…

MALICIOUS

PDF

83.9 KB Created: 2021-04-28 22:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 271da8d2e006701bb0dd5b1b130e020d SHA-1: 78a2f5798ccf4801de37112b7b543356a6ebc1be SHA-256: 63ffb9ae28f9dc84c94ec7b04c0ff0f6e4fbeab823e917f32912d1909dd687bb
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains an embedded URL that redirects to a link farm, which in turn points to a PDF hosted on disposable domains. The document body, though heavily obfuscated, suggests a lure related to 'Hamlet'. The primary malicious indicator is the redirection to the URL https://druttle.ru/strik?utm_term=short+summary+of+hamlet+act+3, which is likely used for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://druttle.ru/strik?utm_term=short+summary+of+hamlet+act+3 PDF link annotation
    • https://cdn.sqhk.co/buzosefif/jijeJhi/mojagi.pdfIn PDF document text
    • http://xilatotes.sportsontheweb.net/73536135531.pdfIn PDF document text
    • http://pugorot.mygamesonline.org/apomixis_and_its_types.pdfIn PDF document text
    • http://bigakeka.iblogger.org/tenuzof.pdfIn PDF document text
    • https://cdn.sqhk.co/tekuligote/Zxjhgha/xemuzigepewa.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/o9mjbsv/codigo_civil_de_guatemala_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/gixelotopa/wifLgd0/55399360566.pdfIn PDF document text
    • http://pefiworawodud.mypressonline.com/second_line_tb_drugs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://veramok.rf.gd/zolugupebasosigojisipewev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bb8b40c-8590-4850-bde3-7f0161363302/can_you_play_star_citizen_for_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/988c3276-3696-4f7f-82a3-9b90c956d56d/json_format_in_chrome.pdfIn PDF document text
    • http://lewarojutuveg.rf.gd/cambridge_igcse_business_studies_coursebook_answers.pdfIn PDF document text
    • http://pineduvo.rf.gd/ambliopia_2020.pdfIn PDF document text
    • http://zokaramizixa.atwebpages.com/a_night_out_harold_pinter.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/how_to_update_kindle_7th_generation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5b7674e-ca9f-47ee-936b-644142b8142d/55017972262.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ab1e36e-8cfa-444e-bdb3-77e11094ffda/gidebefaguzowuromugipep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62f3fe1f-571c-4cfa-a40f-e27e9269f249/2949578562.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/midinezor.pdfIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/assamese_latest_song_free.pdfIn PDF document text
    • http://pulutugorivexek.atwebpages.com/ruxelozukexu.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/worksheet_for_vertebrates_and_invertebrates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e67067c-31b4-40c2-9e20-75295f8dec48/rotokidufipigoxaxe.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_off00010a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A10 5492 bytes
SHA-256: 27ffdf460765d56cc19004de42d490718ca1c43b0cfcb6233cb7054921c470da
font_01_sfnt_off00011c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C99 10936 bytes
SHA-256: 2d3ea9fab8398ee5d63e54437a57f9a105140c1f9e56eb24e3018f4507dc6574

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