Malicious PDF — malware analysis report

Static analysis result for SHA-256 804f3a256fafa53e…

MALICIOUS

PDF

71.1 KB Created: 2021-02-23 13:11:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 884abe6c4a9351c7c208cf94632f65a4 SHA-1: c464f22d9b5aedbb32f6d6ee4c7c96a8e1333e5c SHA-256: 804f3a256fafa53ed43b276e3b715225a74aaf3eb6a3b2c2c64c1fd9c51c95be
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, many pointing to disposable domains and link farms, indicating a phishing or redirection attempt. Heuristics confirm the presence of malicious redirector links and a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=what+are+the+major+factors+affecting+biodiversity+today In PDF document text
    • https://cdn.sqhk.co/wudawagirus/Cidw5Xy/hydraulic_calculations_for_fire_pumps.pdfIn PDF document text
    • http://feedbacrnz.space/chapter_2_cumulative_review_algebra_1_answers48f5w.pdfIn PDF document text
    • http://detonic-romania.website/dua_e_manzil_free_downloadh8qtu.pdfIn PDF document text
    • http://wonder-ita.fun/mubijmztdb.pdfIn PDF document text
    • https://lekozeva.weebly.com/uploads/1/3/5/9/135964777/babijevujuzadetadi.pdfIn PDF document text
    • https://cdn.sqhk.co/velabolo/fUiaKhb/king_art_of_fighting_2.pdfIn PDF document text
    • https://nadatipaj.weebly.com/uploads/1/3/5/3/135347779/sowuze_rumibudexajowak.pdfIn PDF document text
    • http://liketime.online/hoja_de_vida_en_ingles_ejemplo_wordf5e9m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373788/normal_5fe75bfcab110.pdfIn PDF document text
    • https://vukuzimina.weebly.com/uploads/1/3/4/1/134109202/edb36ba117e30f5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zesixefe/92240860330.pdfIn PDF document text
    • https://s3.amazonaws.com/megulu/wafezonaturegu.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/buvedipomaju.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/winasapirike.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/benotoxanedabatozatolav.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/police_report_number_wa.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_off0000d97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97C 5792 bytes
SHA-256: 3c95eab1cc75e6d0c10bbac7e276c6652c31d17da688c438c4c1d422d54bcffd
font_01_sfnt_off0000ed23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED23 10008 bytes
SHA-256: 720a8ccf086196ec74f4e986d2feb5e8a6b498a6de546ad406a6eb22b683623f

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