Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cfa6046eef45d05…

MALICIOUS

PDF

77.0 KB Created: 2021-03-14 16:32:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 5307fab3fc82fb8083dd13456919c494 SHA-1: 09109fa31f64645f380e383ed30d921500ea3b13 SHA-256: 4cfa6046eef45d05d09df6e8a5c073fbe4db3fb568e1b44bd6045a7ce1f6f8e6
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malware. It contains a link farm with numerous external PDF links, including a suspicious URL pointing to maypoin.ru, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to educational material, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/strik?utm_term=palabras+agudas+llanas+y+esdrujulas+4+primaria+pdf PDF link annotation
    • https://cdn.sqhk.co/nidimejuzu/jzJidJz/buzesikopupobe.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzezajolu/hdRVjjF/harris_jayaraj_songs_in_tamil.pdfIn PDF document text
    • https://cdn.sqhk.co/vemetafije/agghcda/sebabekalazavoretolalaluj.pdfIn PDF document text
    • https://cdn.sqhk.co/dukoredod/ibfeij9/voice_recorder_free_download_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/kawinojos/2p59ih0/fruit_cutting_tools.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/5fe77c6e-35b2-4a8c-a898-ddb90a1eba1e/maytag_series_100_washer.pdfIn PDF document text
    • http://luledajosa.epizy.com/57478132080.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df5549cd-6200-4352-b9de-5a1d21125a6b/tenuvezirunodesikigufuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9c143b6-42bd-4a96-bc59-15e60d4b4bb2/hoover_steam_mop_cleaning_solution_alternative.pdfIn PDF document text
    • https://3a0d5408-2ea1-4258-8d29-5d96341cad2c.filesusr.com/ugd/79cb75_9c48fd843c834defa65192eb397dd3bd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/26df939f-3a54-4c24-b50b-88f8ea081906/are_all_derivatives_continuous.pdfIn PDF document text
    • https://781b76d0-895c-4d4e-90f3-491762fad171.filesusr.com/ugd/894952_d202f1be72f34cd3a57c09fa74103f24.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/29d6775a-ce0b-4d76-91c0-0fbb640094fb/ximesobaxisipuzujo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d674371-1eea-4f18-897f-478a046a3fb9/91967228395.pdfIn PDF document text
    • https://0ccb9a81-bd3c-41bd-bc79-2352350f0e5e.filesusr.com/ugd/95ea6b_aa534d210d614ff6bee14184c70a0e3e.pdf?index=trueIn PDF document text
    • http://kozifina.epizy.com/rowal.pdfIn PDF document text
    • https://6776ac3f-883f-499f-bc52-38dff818ec46.filesusr.com/ugd/969751_38875f3d549446989cc269c338d57ae4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d57c6a01-b93b-4688-9591-1a1990f5bf12/different_types_of_camera_shots_angles_and_movements.pdfIn PDF document text
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_aed45df0191b484191591dbc7271c62a.pdf?index=trueIn PDF document text
    • http://satoposip.epizy.com/livurelupasazuti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c17940c9-7178-416b-a089-bbd6c5660747/2005_honda_rancher_350_tire_pressure.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56B 5768 bytes
SHA-256: 84f22eee8525cffc8f779a90e73e4b50ba292f9193f3cd2296ba332bbd12877d
font_01_sfnt_off0000e90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90F 11352 bytes
SHA-256: 33c59e6f3a4f0689cf0f8a56a2c87144d3b6add94e2bc10396e24951bca43fe6
font_02_sfnt_off00010eb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB3 16164 bytes
SHA-256: b68b0740fa03982756c50cf71ba91bd1c73418125a29db080538f24aebd90fb1

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