Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec3ae36981fc9b65…

MALICIOUS

PDF

81.8 KB Created: 2021-06-03 00:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 3decc9a21ac0ed1448ade04cdba5524d SHA-1: 1a5fb46ce349a43f65af9c5a287311af609d259a SHA-256: ec3ae36981fc9b65f5e766ba62444ed8e2116676a882d88c45b68818aebe21aa
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting services, suggesting a link farm or phishing campaign. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a large number of outbound links designed to direct users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

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://allytemp.ru/pbw?utm_term=hp+laserjet+p3015+fuser+replacement+instructions PDF link annotation
    • https://rajopolaxobi.weebly.com/uploads/1/3/1/4/131406270/7124186.pdfIn PDF document text
    • https://fiduwovizeget.weebly.com/uploads/1/3/4/5/134517619/d394729f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379982/normal_600bbc65c5313.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447662/normal_60503dc4e22c3.pdfIn PDF document text
    • https://nekazadezi.weebly.com/uploads/1/3/4/6/134662300/1578717.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456999/normal_5fe81af26a2da.pdfIn PDF document text
    • https://konilusikiwi.weebly.com/uploads/1/3/3/9/133986353/zinofolujize.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417537/normal_5fd9dca1df6c5.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/b30f10ad-052d-485c-a8cf-77ba3d325e05/1647048711.pdfIn PDF document text
    • http://gediripu.pbworks.com/w/file/fetch/144422868/88292162301.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45c36355-5206-4acf-8781-ec49efe19958/fortnite_android_download_device_not_supported.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0b59753-8f1f-4cde-8e9b-f71abe254e1c/problemas_de_ecuaciones_1_bachillerato_resueltos.pdfIn PDF document text
    • http://visetululiv.pbworks.com/w/file/fetch/144415209/nuvipiduvupavejenapabuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/248e6fe5-a5db-45ac-900e-0b9d93b36194/45907647696.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144415533/hypertensive_emergency_guidelines_jnc_8.pdfIn PDF document text
    • http://risoxef.pbworks.com/w/file/fetch/144454203/rohs_reach_compliance_letter_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e281ad2-341d-4a5e-99a8-19813e0d4d5b/champion_generators_for_sale_cheap.pdfIn PDF document text
    • http://mujefapufefi.pbworks.com/w/file/fetch/144515556/libro_de_formulas_quimicas_para_productos_de_limpieza.pdfIn PDF document text
    • http://wejojixi.pbworks.com/f/realidades_1_capitulo_7a_actividad_11_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44ba695a-4cf3-4b70-b52f-c94640238d39/migob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a152cdc-7316-47f2-95a6-19c38920c67e/in_christ_alone_hymn_sheet_music.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_off0000f5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F7 5564 bytes
SHA-256: c54a0bbbef74c3981873c691aa327fc18eb943e7f517a23dde9dc8304814a2e5
font_01_sfnt_off000108ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CA 10044 bytes
SHA-256: 4c82432edf8899f9f94d382e3d8a3a2eefd8ca5d8a5e64701a30e5da52c8fc0a
font_02_sfnt_off00012b34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B34 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3