Malicious PDF — malware analysis report

Static analysis result for SHA-256 94b7de16a3c7d434…

MALICIOUS

PDF

71.6 KB Created: 2021-04-26 16:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 66ffde5fe536a2c1e495429a80574e84 SHA-1: 48ee20bfd57494ff1a5dde2d065c820b664e8989 SHA-256: 94b7de16a3c7d434696c3089d7252f0fd9727a6a61caf5942a1a60ffeb369e33
186 Risk Score

Malware Insights

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

The PDF file contains a high number of external links, with several heuristics indicating it's a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://bologen.ru/strik?utm_term=ley+de+cierre+en+puerto+rico PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4418991/normal_60033b091d150.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366405/normal_5fcd1663c22f6.pdfIn PDF document text
    • http://kilubome.iblogger.org/2020_calendar_with_tamil_nadu_holidays.pdfIn PDF document text
    • http://nurokeg.22web.org/jrcalc_guidelines_2019.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b595a6f9-6bcb-48d8-acfc-7cb8c696cf55.filesusr.com/ugd/21f311_cbe7d89eb6f84f3298a26c38b473c1eb.pdf?index=trueIn PDF document text
    • https://488c2ff9-9ff4-499e-8f11-525115e20b22.filesusr.com/ugd/8aba0c_34c0ce897d024b979818803fcfdbd579.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b8fd6ac-cf4b-4b16-a9cd-475c0628ea1a/engineering_drawing_book_by_k_venugopal_free_download.pdfIn PDF document text
    • http://pufufatorum.epizy.com/gomovejaxuvozure.pdfIn PDF document text
    • https://a540aa65-2eb1-4ac3-86d0-bf6a54daac96.filesusr.com/ugd/2d797c_9d6a432eda2c403a925f17a9567288f9.pdf?index=trueIn PDF document text
    • http://revenunazikun.rf.gd/komesake.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/476e341d-00b1-46e7-a559-7cac68a5be57/luxowazisalen.pdfIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/matlab_plot_title_underscore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1dc425e-e791-4f8f-8434-02ac435654c0/what_are_the_key_features_of_musical_theatre.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9e06dea-9ada-4402-af41-cd263910564b/xixizudesew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5c17a23-9b3b-4846-b335-4389ee9a594c/aimpoint_pro_patrol_rifle_optic_red_dot_riflescope.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc66b430-57d4-4391-b326-caeee2de2f79/2299098908.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/how_to_use_snark_violin_tuner.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/more_effective_c_download.pdfIn PDF document text
    • http://fasekefap.epizy.com/download_i_am_lyrics_by_mercy_chinwo.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_off0000daa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA6 4688 bytes
SHA-256: dc5f01561774897e3acab6c9c7c8da61c2de591ff4d03987d9d2b67780fdfbd2
font_01_sfnt_off0000eab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB8 11420 bytes
SHA-256: 60bef55f8d016a0e632b5ee8d6d798c999a6edc6b510c4ae3f2c860c9406393d

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