Malicious PDF — malware analysis report

Static analysis result for SHA-256 7855c6fe924a65ea…

MALICIOUS

PDF

76.2 KB Created: 2021-06-06 06:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 06b08e68109eabdd2c59c295c5e6f2f0 SHA-1: d8fe9aabc51d91549b76a9b6b1246a4b20a241e1 SHA-256: 7855c6fe924a65eab5f54646dcb3df81cd73c1e8b629ff170a46359345bddd59
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://seumenha.ru/123?utm_term=informed+consent+form+template+uk PDF link annotation
    • https://sopowifumerage.weebly.com/uploads/1/3/4/3/134355846/weduwolikep-feguses-podusuzi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427104/normal_604981185ef78.pdfIn PDF document text
    • https://jugurapofan.weebly.com/uploads/1/3/4/3/134339640/6b8c0257b27de35.pdfIn PDF document text
    • https://lulakoxefinadi.weebly.com/uploads/1/3/4/3/134332070/3030d5f.pdfIn PDF document text
    • https://besuxape.weebly.com/uploads/1/3/4/3/134374749/4665961.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486042/normal_5fdc74ea2aa3e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://divogatupum.pbworks.com/f/expert_system_components.pdfIn PDF document text
    • http://jiboduxoguv.pbworks.com/f/what_counts_toward_clergy_housing_allowance.pdfIn PDF document text
    • http://mizelabe.pbworks.com/w/file/fetch/144623283/13803441572.pdfIn PDF document text
    • http://fevuxowina.pbworks.com/w/file/fetch/144577365/88647918484.pdfIn PDF document text
    • http://zepupifob.pbworks.com/f/basit_eitsizlikler_km_sorular_tyt_ayt.pdfIn PDF document text
    • http://kunozulig.pbworks.com/w/file/fetch/144613839/free_shutter_count_checker.pdfIn PDF document text
    • http://pokuwatosat.pbworks.com/w/file/fetch/144574965/tixuduxomikorebedol.pdfIn PDF document text
    • http://gabumur.pbworks.com/f/68809908357.pdfIn PDF document text
    • http://lifelekufa.pbworks.com/f/78360897897.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8243ead6-9b4e-43c4-a9c4-9dbaeb656dc7/povamutuxajo.pdfIn PDF document text
    • http://bezawagiga.pbworks.com/w/file/fetch/144555126/educational_psychology_objective_questions_and_answers_in_hindi.pdfIn PDF document text
    • http://mivegaz.pbworks.com/f/ejercicios_de_economa_1_bachillerato_resueltos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af925a24-1d02-4b8e-bab6-26fed9c9a4e1/jesuit_oath.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_off0000ec04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC04 5304 bytes
SHA-256: 4bc83967b23724a4b9c8f6390a72d8e8e3a5598b7bee4db71158d00e752842af
font_01_sfnt_off0000fdfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFB 11164 bytes
SHA-256: 019a02ec31907ac632a6d5cf7ee0519f022f551071535e8177ea283fd36a3f98

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