Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d60f8c38936a8d4…

MALICIOUS

PDF

76.8 KB Created: 2021-03-21 07:27:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 3bdefe829458b9b7a7e8b7e8e50b15f3 SHA-1: 20c9ecc698dc5089eeb94468fb3c7913dd874273 SHA-256: 8d60f8c38936a8d4b8701b58a98de5a3ca60ec7f511a61ff686b3fb74df65703
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document contains a large number of external links, with many pointing to disposable hosting services, suggesting a link farm or SEO spamming operation. The presence of multiple external URIs and the ML classification strongly suggest this PDF is designed to lead users to potentially harmful content or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/award?keyword=modelo+biopsicosocial+en+trabajo+social+pdf PDF link annotation
    • https://dawejufajipamoz.weebly.com/uploads/1/3/5/3/135350304/6175067.pdfIn PDF document text
    • http://ehaberdevlet.com/blood_relation_questions_in_gujaratijra40.pdfIn PDF document text
    • http://kelijoninofi.22web.org/ubqari_magazine_september_2020_download.pdfIn PDF document text
    • http://bigops.fun/xamigave9ycve.pdfIn PDF document text
    • https://pamezupiv.weebly.com/uploads/1/3/0/7/130775156/8495344.pdfIn PDF document text
    • http://prod-fruit.space/kokewokisujevenos6dllh.pdfIn PDF document text
    • https://litolojinoforiw.weebly.com/uploads/1/3/4/7/134721995/3a8d7db.pdfIn PDF document text
    • http://mbfsopg.com/bekuvaregvjrtk.pdfIn PDF document text
    • https://vuzipelafow.weebly.com/uploads/1/3/4/6/134688966/1659259.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sosejelufati.epizy.com/tusuwujaziwotegikilogivo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ebf47f0-bc90-4592-a377-0ab7b87f27cd/how_to_program_a_ge_universal_remote_to_an_emerson_tv.pdfIn PDF document text
    • http://bekujefil.epizy.com/ap_literature_multiple_choice_2018.pdfIn PDF document text
    • http://rodususu.rf.gd/les_barricades_mysterieuses_guitar_tab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36da5065-5386-4ccd-98a0-04c4ca2bafb0/zirovuzutotovuxovexojelub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b323b65a-e40b-40e9-b383-b1ed37eae49e/the_final_empire_characters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19a43926-6d6a-4a0c-93b9-31e375eaccce/fojezes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/843b8207-728c-47c6-971f-a9bf9426eba6/39658357736.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bd2c839-976d-41bf-a274-a1435bc30b9b/69793125980.pdfIn PDF document text
    • http://tefesapebeto.rf.gd/1783103074.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d924b320-266c-48d1-b9a2-39cdccb31248/vewakiri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c06323a1-56dd-4c17-bf66-db5d87dd415c/osha_regulations_for_residential_construction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eaa947aa-56fb-45e6-8d2d-28704712788f/zig_ziglar_net_worth_2019.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_off0000ecd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD4 5372 bytes
SHA-256: 5f7b16c62d16add281b64ce2a746ed4a863e3316266d6b6bed024a63f928f355
font_01_sfnt_off0000ff32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF32 11756 bytes
SHA-256: 05372bfebfdff79e60cf10d03239048c55cf649e2d035cb75341393439ed40f2