Malicious PDF — malware analysis report

Static analysis result for SHA-256 89c83219ef347a9d…

MALICIOUS

PDF

77.7 KB Created: 2021-03-04 15:03:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 75a57145e374db7e6295dd2b091a906f SHA-1: bf75624c3c2eab3fd4d3202ea699da06ee09d07c SHA-256: 89c83219ef347a9dbf98bcc101d8edaf1746ece30fbe4f3132644c3f3a99c932
194 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with critical heuristics indicating it functions as a link farm. Multiple external URLs are present, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nipisod.ru/strik?utm_term=gerund+activities+with+answers PDF link annotation
    • http://ig-objectionform.com/how_much_does_wife_inherit_in_islamhc514.pdfIn PDF document text
    • https://nixabuvibowigev.weebly.com/uploads/1/3/4/3/134308208/9749603.pdfIn PDF document text
    • http://quinzsy-studio.design/aramco_operational_calendar_2020_downloadmlvda.pdfIn PDF document text
    • https://nitevafatuva.weebly.com/uploads/1/3/4/8/134872456/dfccb1d923.pdfIn PDF document text
    • https://wufovepujiz.weebly.com/uploads/1/3/0/7/130775368/tiwegej-domarigatege.pdfIn PDF document text
    • http://activa-fb.com/spintires_free_download_utorrentsszvt.pdfIn PDF document text
    • https://gugukufetufa.weebly.com/uploads/1/3/4/3/134337187/fafuforupamogo.pdfIn PDF document text
    • https://mojoranazo.weebly.com/uploads/1/3/4/4/134403481/vovinaditukari.pdfIn PDF document text
    • http://astropsychology.website/2013_audi_a7_owners_manualbrz3n.pdfIn PDF document text
    • http://akmurzina.com/is_spanish_the_sexiest_languageak75y.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/01d9b992-058c-4ec4-9ff0-e44bc50d7a8d/quem_no_sabe_para_onde_vai_qualquer_caminho_serve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a509f202-cffc-4b56-b17a-c5f26f3628ef/batavofakodikewotavazodi.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/tutozumexesow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a90ffbaa-58ca-4eb9-ba69-d99bcc1bf403/the_keto_carbs_cookbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84805777-7cbd-4613-b771-10ff0d24ae61/what_does_commercial_vehicles_only_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/kufobupewazifedukuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03fc2926-429a-471a-93d5-e2e19ea8b85e/warhammer_end_times_vermintide_2_trainer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e549b158-a519-4d72-8668-a557986f915b/make_your_own_simple_syrup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f7106ca-1670-4846-a6ad-6bbbd92699a6/fobifida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89ab2f4f-e9a6-4784-9285-51001a6deda2/konosuba_light_novel_volume_12_epub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b1e42b7-0769-4c17-9c9a-f4691f0ffd9c/asp.net_mvc_sample_project_code.pdfIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/febazovop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/840df6ee-d17d-4f65-b83a-1f785848c727/python_convert_dictionary_values_to_set.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/vutesotu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47C 4952 bytes
SHA-256: 25d53ab5da9fed8040a67c2aac3371319082109afe4d9aac7fb8932db9672133
font_01_sfnt_off0000f55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55C 11208 bytes
SHA-256: a20e855ba1b5dfbcfdd5d626eeed10cea18b7322956825285b77d67c2d0066eb
font_02_sfnt_off00011b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1B 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361